Claims:1. A method for improving phase non-linearity in an ultra-wide band multichannel homodyne receiver, the method comprising:
receiving, at a first RF port of a front end receiver (FER) module of the homodyne receiver, a first set of signals, wherein the FER module comprises a first gain stage to amplify the first set of signals;
tapping, and attenuating, by an attenuator, the first set of signals to provide a first set of attenuated signals;
receiving, at a reference Local Oscillator module of the homodyne receiver, the first set of attenuated signals; wherein the reference LO module comprises a second gain stage to amplify the first set of attenuated signals;
mixing, at the reference LO module, the amplified set of attenuated RF signal with a temperature compensated crystal oscillator signal to generate a set of upconverted signals;
amplifying, at a third gain stage of the reference LO module, the set of upconverted signals to provide amplified set of upconverted signals;
mixing, at the FER module, the amplified first set of signals with the amplified set of upconverted signal being received at a second port of the FER module to generate a set of output signals having improved phase non-linearity.
2. The method as claimed in claim 1, wherein the method comprises the steps of filtering the first set of signals by a first filter of the FER module before amplification by the first gain stage to remove out of band signals.
3. The method as claimed in claim 1, wherein the method comprises the steps of:
filtering, by a second filter of the FER module, the set of output signals;
amplifying, by a set of amplifiers of the FER module, the filtered output signals.
4. The method as claimed in claim 3, wherein the method comprises the step of converting, a 90o hybrid circuit of the FER module, the amplified output signals into I and Q signals.
5. The method as claimed in claim 1, wherein the method comprises the step of filtering, by a third filter of the reference LO module, the temperature compensated crystal oscillator signal before transmitting to the second mixer.
6. The method as claimed in claim 1, wherein the method comprises the step of filtering, by a fourth filter of the reference LO module, the set of upconverted signals before transmitting to the third gain stage of the reference LO module.
7. A system for improving phase non-linearity in an ultra-wide band multichannel homodyne receiver, the system comprising:
a front end receiver (FER) module of the homodyne receiver comprising a first RF port, a second RF port, a first gain stage, and a first mixer, wherein the FER module is configured to receive a first set of signals at the first RF port, and amplify the first set of signals at the first gain stage to provide a first set of amplified signals;
an attenuator operatively coupled to the FER module, and configured to receive the first set of signals from the FER module;
a reference Local Oscillator (LO) module of the homodyne receiver configured between the attenuator and the FER module, wherein the reference LO module is configured to receive the first set of attenuated signals, and comprises:
a second gain stage to amplify the received first set of attenuated signals;
a second mixer operatively coupled to the second gain stage, wherein second mixer is configured to mix the amplified set of attenuated RF signal with a temperature compensated crystal oscillator (TCXO) signal to generate a set of upconverted signals; and
a third gain stage to amplify the set of upconverted signals;
wherein the FER module is configured to receive and mix the set of attenuated upconverted signal with the first set of amplified signals, at the first mixer, to generate a set of output signals having improved phase non-linearity.
8. The system as claimed in claim 7, wherein the reference LO module comprises a TCXO to generate the signal, and wherein the reference LO module comprises a third filter to filter the TCXO signal.
9. The system as claimed in claim 7, wherein the homodyne receiver comprises a power divider to receive the first set of signals and provide the first set of signals to the first gain stage and the attenuator.
10. The system as claimed in claim 7, wherein components of the system are arranged in a multideck assembly comprising a top layer, a middle layer, and a lower layer, and wherein the FER module is configured in the top layer, the upconverted reference LO signal distribution circuit is configured in the middle layer, and a power distribution circuitry is positioned in the lower layer.
, Description:TECHNICAL FIELD
[0001] The present disclosure relates to the field of communication system for electronic warfare in airborne as well as ground application. More particularly, the present disclosure relates to a system and method for improving phase non-linearity in wideband multi-channel homodyne receiver.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Wireless communication systems are getting advanced day-by-day to provide higher speed communication with reliability for improved and efficient usage. In general, there are two solutions for multiple standards operation of communication system, which can be listed as narrowband solution and wideband solution. Narrowband solution requires multiple narrowband receiver front-ends and off-chip surface-acoustic-wave (SAW) filters, whereas, wideband solution requires a single wideband receiver that can cover a specific spectrum.
[0004] The wideband solution is widely utilized for designing of software-defined radios and reconfigurable receivers. However, in the wideband operation, wideband interference problems occur frequently. The wideband interference arises due to non-linearity and simultaneous operation of a number of radios with varying standards. Moreover, interference and non-linearity can be generated in transmitted signal because of poor isolation between transmitter and receiver. Also, the transmitted signal generates interference and non-linearity for other devices if they have active receivers operating at the same time, which reduces reliability and efficiency of the devices. Hence, interference and non-linearity should be effectively removed, or reduced to a minimal value. In electronic warfare in airborne as well as ground application, the accuracy and reliability of the receiver are highly required.
[0005] The United States document number US9509354B2 titled “Homodyne Receiver with Improved Linearity" provides a Homodyne comprising a first mixer with an RF input port and an LO input port for an LO signal and an output port for the output signal of the first mixer which is also arranged to be the output port of the homodyne receiver. The homodyne receiver also comprises a control unit for controlling signal leakage from the LO input port to the RF input port of the first mixer. The control unit is arranged to control the leakage in amplitude and phase so that second order distortion products and third order distortion products which are created when RF and LO signals are mixed in the first mixer exhibit similar amplitudes but a phase difference of 180 degrees. But this invention comprises a complex circuitry which makes its working cumbersome.
[0006] The United States document number US 6192225B1 titled" Direct Conversion Receiver" comprises a homodyne receiver, which according to the present invention includes a signal input and first and second mixers coupled to the signal input. A local oscillator provides a reference signal at the frequency of modulation of the input signal. The reference signal output by the local oscillator is passed through a switchable phase change element changes the phase of an input signal by a predetermined phase based on the state of a control input such that the output of the phase change element in one element is p radians out of the phase with the output of the phase change element in the other state. The second phase change element changes the phase of an input signal by p/2 radians. The outputs of the mixers are coupled to a pair of switchable inverters and low pass filters. Switching of the switchable phase change element and the switchable inverters is controlled by a switching oscillator. But this invention requires an additional circuitry for phase-change, and moreover, do not provide large dynamic range with better sensitivity.
[0007] The United States document number US 5896061 titled "Homodyne Receiver and Process for Correcting the Converted Received Signal”. The invention pertains to a homodyne receiver, in particular for angle-modulated carrier signals in which the converted signal (ZF) has a d.c. voltage portion, and a process for correcting the converted receiving signal. Essentially three classes of errors occur with homodyne receivers: d.c. offset, amplitude difference and phase errors between the in-phase (I) and quadrature phase (Q) branches. Standard adjustments of the local oscillators with phase-locked loop (PLL) do not work in the case of weak signals. To use cost effective, rapid analog/digital converters, particularly the d.c. offset has to be separate out. In so far as this has been done previously and the I&Q signal were corrected also, these corrections could be accomplished only with expensive components in RF class. To avoid this invention provides an arithmetic unit that is designed for converting into a circle the ellipse set by the distorted I &Q signals. The ellipse parameters are determined in particular by means of an equalizing computation using at least five samples of the I &Q signals. From the ellipse parameters the errors causing the elliptical form are then calculated and compensated.
[0008] Therefore, there is a need in the art for a system and method for improving non-linearity in a multichannel, wide Band, large dynamic range with better sensitivity homodyne receiver, without using any additional phase and amplitude controller circuitry.

OBJECTS OF THE PRESENT DISCLOSURE
[0009] Some of the objects of the present disclosure, which at least one embodiment herein satisfies are as listed herein below.
[0010] It is an object of the present disclosure to improve phase non-linearity in a wideband homodyne receiver.
[0011] It is an object of the present disclosure to provide a system and method for improving non-linearity in a multichannel, wide Band, large dynamic range with better sensitivity homodyne receiver, without using any additional phase and amplitude controller circuitry.
[0012] It is an object of the present disclosure to provide a light weight and compact size system to improve phase non-linearity in a wideband homodyne receiver.
[0013] It is an object of the present disclosure to provide a homodyne receiver with improved phase non-linearity, having sufficient filtering to suppress noise in the receiver.

SUMMARY
[0014] The present disclosure relates to the field of communication system for electronic warfare in airborne as well as ground application. More particularly, the present disclosure relates to a system and method for improving phase non-linearity in wideband multi-channel homodyne receiver.
[0015] An aspect of the present disclosure pertains to a method for improving phase non-linearity in an ultra-wide band multichannel homodyne receiver, the method comprising: receiving, at a first RF port of a front end receiver (FER) module of the homodyne receiver, a first set of signals, wherein the FER module may comprise a first gain stage to amplify the first set of signals; tapping, and attenuating, by an attenuator, the first set of signals to provide a first set of attenuated signals; receiving, at a reference Local Oscillator module of the homodyne receiver, the first set of attenuated signals; wherein the reference LO module may comprise a second gain stage to amplify the first set of attenuated signals; mixing, at the reference LO module, the amplified set of attenuated RF signal with a temperature compensated crystal oscillator signal to generate a set of upconverted signals; amplifying, at a third gain stage of the reference LO module, the set of upconverted signals to provide amplified set of upconverted signals; mixing, at the FER module, the amplified first set of signals with the amplified set of upconverted signal being received at a second port of the FER module to generate a set of output signals having improved phase non-linearity.
[0016] In an aspect, the method may comprise the steps of filtering the first set of signals by a first filter of the FER module before amplification by the first gain stage to remove out of band signals.
[0017] In an aspect, the method may comprise the steps of: filtering, by a second filter of the FER module, the set of output signals; amplifying, by a set of amplifiers of the FER module, the filtered output signals.
[0018] In an aspect, the method may comprise the step of converting, a 90o hybrid circuit of the FER module, the amplified output signals into I and Q signals.
[0019] In an aspect, the method may comprise the step of filtering, by a third filter of the reference LO module, the temperature compensated crystal oscillator signal before transmitting to the second mixer.
[0020] In an aspect, the method may comprise the step of filtering, by a fourth filter of the reference LO module, the set of upconverted signals before transmitting to the third gain stage of the reference LO module.
[0021] Another aspect of the present disclosure pertains to a system for improving phase non-linearity in an ultra-wide band multichannel homodyne receiver, the system comprising: a front end receiver (FER) module of the homodyne receiver comprising a first RF port, a second RF port, a first gain stage, and a first mixer, wherein the FER module may be configured to receive a first set of signals at the first RF port, and amplify the first set of signals at the first gain stage to provide a first set of amplified signals; an attenuator operatively coupled to the FER module, and which may be configured to receive the first set of signals from the FER module; a reference Local Oscillator (LO) module of the homodyne receiver configured between the attenuator and the FER module, wherein the reference LO module may be configured to receive the first set of attenuated signals, and the reference LO module may comprises: a second gain stage to amplify the received first set of attenuated signals; a second mixer operatively coupled to the second gain stage, wherein second mixer may be configured to mix the amplified set of attenuated RF signal with a temperature compensated crystal oscillator (TCXO) signal to generate a set of upconverted signals; and a third gain stage to amplify the set of upconverted signals; wherein the FER module may be configured to receive and mix the set of attenuated upconverted signal with the first set of amplified signals, at the first mixer, to generate a set of output signals having improved phase non-linearity
[0022] In an aspect, the reference LO module may comprise a TCXO to generate the signal, and wherein the reference LO module may comprise a third filter to filter the TCXO signal
[0023] In an aspect, the homodyne receiver may comprise a power divider to receive the first set of signals and provide the first set of signals to the first gain stage and the attenuator.
[0024] In an aspect, components of the system may be arranged in a multideck assembly comprising a top layer, a middle layer, and a lower layer, and wherein the FER module may be configured in the top layer, the upconverted reference LO distribution circuit may be configured in the middle layer, and a power distribution circuitry may be positioned in the lower layer.

BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0026] The diagrams are for illustration only, which thus is not a limitation of the present disclosure, and wherein:
[0027] FIG. 1 illustrates block diagram of the proposed system to implement the method to improve phase non-linearity in wideband Multichannel Homodyne Receiver, in accordance with an exemplary embodiment of the present disclosure.
[0028] FIG. 2 illustrates arrangement of an exemplary microwave device in the front end receiver (FER) module, in accordance with an exemplary embodiment of the present disclosure.
[0029] FIG. 3 illustrates arrangement of an exemplary microwave devices in the reference LO module, in accordance with an exemplary embodiment of the present disclosure
[0030] FIG. 4 illustrates cross section view of Multi deck Microwave Assembly describing the FER module realized using unique layout arrangement methodology of multi deck microwave assembly to reduce weight and form factor, in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[0031] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0032] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0033] In some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[0034] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0035] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0036] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0037] The present disclosure relates to the field of communication system for electronic warfare in airborne as well as ground application. More particularly, the present disclosure relates to a system and method for improving phase non-linearity in wideband multi-channel homodyne receiver.
[0038] According to an aspect, the present disclosure elaborates upon a method for improving phase non-linearity in an ultra-wide band multichannel homodyne receiver, the method including: receiving, at a first RF port of a front end receiver (FER) module of the homodyne receiver, a first set of signals, wherein the FER module can include a first gain stage to amplify the first set of signals; tapping, and attenuating, by an attenuator, the first set of signals to provide a first set of attenuated signals; receiving, at a reference Local Oscillator module of the homodyne receiver, the first set of attenuated signals; wherein the reference LO module can include a second gain stage to amplify the first set of attenuated signals; mixing, at the reference LO module, the amplified set of attenuated RF signal with a temperature compensated crystal oscillator signal to generate a set of upconverted signals; amplifying, at a third gain stage of the reference LO module, the set of upconverted signals to provide amplified set of upconverted signals; mixing, at the FER module, the amplified first set of signals with the amplified set of upconverted signal being received at a second port of the FER module to generate a set of output signals having improved phase non-linearity.
[0039] In an embodiment, the method can include the steps of filtering the first set of signals by a first filter of the FER module, before amplification by the first gain stage to remove out of band signals.
[0040] In an embodiment, the method can include the steps of: filtering, by a second filter of the FER module, the set of output signals; amplifying, by a set of amplifiers of the FER module, the filtered output signals.
[0041] In an embodiment, the method can include the step of converting, a 90o hybrid circuit of the FER module, the amplified output signals into I and Q signals.
[0042] In an embodiment, the method can include the step of filtering, by a third filter of the reference LO module, the temperature compensated crystal oscillator signal before transmitting to the second mixer.
[0043] In an embodiment, the method can include the step of filtering, by a fourth filter of the reference LO module, the set of upconverted signals before transmitting to the third gain stage of the reference LO module.
[0044] According to another aspect, the present disclosure elaborates upon a system for improving phase non-linearity in an ultra-wide band multichannel homodyne receiver, the system including: a front end receiver (FER) module of the homodyne receiver including a first RF port, a second RF port, a first gain stage, and a first mixer, wherein the FER module can be configured to receive a first set of signals at the first RF port, and amplify the first set of signals at the first gain stage to provide a first set of amplified signals; an attenuator operatively coupled to the FER module, and which can be configured to receive the first set of signals from the FER module; a reference Local Oscillator (LO) module of the homodyne receiver configured between the attenuator and the FER module, wherein the reference LO module can be configured to receive the first set of attenuated signals, and the reference LO module can includes: a second gain stage to amplify the received first set of attenuated signals; a second mixer operatively coupled to the second gain stage, wherein second mixer can be configured to mix the amplified set of attenuated RF signal with a temperature compensated crystal oscillator (TCXO) signal to generate a set of upconverted signals; and a third gain stage to amplify the set of upconverted signals; wherein the FER module can be configured to receive and mix the set of attenuated upconverted signal with the first set of amplified signals, at the first mixer, to generate a set of output signals having improved phase non-linearity.
[0045] In an embodiment, the reference LO module can include a TCXO to generate the signal, and wherein the reference LO module can include a third filter to filter the TCXO signal
[0046] In an embodiment, the homodyne receiver can include a power divider to receive the first set of signals and provide the first set of signals to the first gain stage and the attenuator.
[0047] In an embodiment, components of the system can be arranged in a multideck assembly including a top layer, a middle layer, and a lower layer, and wherein the FER module can be configured in the top layer, the upconverted reference LO distribution circuit can be configured in the middle layer, and a power distribution circuitry can be positioned in the lower layer.
[0048] FIG. 1 illustrates block diagram of the proposed system to implement the proposed method to improve phase non-linearity in wideband Multichannel Homodyne Receiver, in accordance with an exemplary embodiment of the present disclosure.
[0049] As illustrated, in an aspect, the system for improving the phase non-linearity of an ultra-wideband Multichannel homodyne receiver 1 is disclosed. The system can include a front end receiver (FER) module 2 which can include a first RF port 5, a second RF port 9, a first gain stage G3 (38), and a first mixer 37. The FER module 2 can be configured to receive a first set of signals (also referred to as Rf signals, herein) at the first RF port 5, and amplify the RF signals at the first gain stage 38 to provide a first set of amplified signals.
[0050] In an embodiment, an attenuator pad P1 (also referred to as attenuator 36, herein) can be operatively coupled to the FER module 2, and which can be configured to receive the RF signals from the FER module 2. The system can include a reference Local Oscillator (LO) module 3 of the homodyne receiver configured between the attenuator 36 and the FER module 2, where the reference LO module 3 can be configured to receive the attenuated RF signals.
[0051] In an embodiment, the reference LO module 3 can include a second gain stage G2 (25) to amplify the received attenuated RF signals. The reference LO module 3 can include a second mixer 30 operatively coupled to the second gain stage 25, where the second mixer 30 can be configured to mix the amplified RF signal with a temperature compensated crystal oscillator (TCXO) signal to generate a set of upconverted signals at LO port 9. In an embodiment, a third gain stage 28 of the reference LO module 3 can amplify the set of upconverted signals.
[0052] In an embodiment, the FER module 2 can be configured to receive the set of upconverted signals at an LO port 6 of the mixer 37, and further receive the first set of amplified signals at the port 15 of the mixer 37. The first mixer 37 can mix the set of attenuated upconverted signal with the first set of amplified signals to generate a set of output signals having improved phase non-linearity, at output port 7a, 7b.
[0053] In an implementation a first set of signals (also referred to as RF signals, herein) at an antenna port can be fed to the RF Port 5 of the FER module 2. Further, a tapped RF signal can be fed to a RF Port 8 of the reference LO module 3 through the attenuator pad 36, which can be mixed with a fixed TCXO signal (also referred to as Intermediate Frequency (IF) signals) i.e. RF+IF at a LO port 9 of the reference LO Module to generate a LO Signal after mixing, to generate the output signals at the output port 7a, 7b of the FER module 2.
[0054] The step of improving phase nonlinearity of the homodyne receiver can be done by deriving the gain stages 25, 28, 38, and the attenuator 36 in the multichannel ultra-wide band homodyne receiver 1 over the entire band and across the full dynamic range by maintaining the noise level lower than RF input signal at the input port 15 of mixer 37 in the FER module 2.
[0055] The proposed system enables the homodyne receiver to achieve a phase non linearity more than ±15° over the entire frequency band and over the entire dynamic range by adjusting gain stages 25, 28, 38 and attenuator pad 36, without using any phase cancellation and amplitude adjustment circuitry.
[0056] FIG. 2 illustrates arrangement of an exemplary microwave device in the front end receiver (FER) module in accordance with an exemplary embodiment of the present disclosure.
[0057] As illustrated in FIG. 2, in an embodiment, the front end receiver (FER) module 2 is disclosed. The incoming RF signal at the RF Port 5 of FER can be down converted to an IF by mixing it with a homodyne LO signal (RF+IF) from the reference LO module 3. In an embodiment, the two channels of FER can be kept in a single module. Further, the FER module can include a limiter 10, a low noise amplifier (LNA) 11, a band pass filter 12, a Power divider 13 and a gain stages 14, which can be kept in the lineup before mixing at the mixer 37. The out of band signals from the RF signals can be rejected by the filter 12 before mixing at the mixer 37. The RF signals can be amplified using the LNA 11 and the gain stages 14.
[0058] In an embodiment, the RF signal, and the LO signals (ie. Upconverted signals from the reference LO module 3) can be mixed to get down converted IF signal at the port 17. The down converted IF signal can be filtered using band pass filters 19 a, 19b, amplified using IF amplifiers 20a & 20b, and can be further converted to In-phase and quadrature (I and Q) signals 7a,7b using a 90° hybrid 22.
[0059] In an implementation, the down converted IF output signals 7a,7b from the RF chains can be fed to a phase measurement module in order to obtain the required BLI phase combinations.
[0060] The distributed Gain stage arrangement 25,28 in the reference LO module 3 can reduce inter mod products coupled with LO signal.
[0061] FIG. 3 illustrates arrangement of an exemplary microwave devices in the reference LO module, in accordance with an exemplary embodiment of the present disclosure.
[0062] As illustrated in FIG. 3, in an embodiment, the reference LO module 3 is disclosed. The reference LO module 3 can generate a Local Oscillator signal (Homodyne LO) which can be higher than the incoming RF signal for the FER 2. The tapped/sampled RF signal from the FER 2 can be fed as input to the reference LO module at port 8. The tapped Rf signal can get amplified using the gain stages G1 (23) and can then be fed to the mixer 30 for up conversion. In an embodiment, the TCXO 24 can generate a stable signal that can be filtered using a band pass filter (BPF) 25, and the level of the tapped RF signal can be adjusted using the attenuator pad 26, and further fed to IF port 27 of the mixer 30 for up conversion. The up converted signal can then be filtered using a band pass filter 31, and passed through series of amplifiers 32 of Gain G2 to cater LO requirement of all the FERs.
[0063] FIG. 4 illustrates cross section view of Multi deck Microwave Assembly describing the FER module realized using unique layout arrangement methodology of multi deck microwave assembly to reduce weight and form factor, in accordance with an exemplary embodiment of the present disclosure.
[0064] As illustrated in FIG. 4, the FER module 2 can be realized using unique layout arrangement methodology of multi deck microwave assembly to reduce weight and form factor. Layer to layer transition has been realized using vertical glass beads 40 and vertical DC feed throughs. The two RF channels 39 in single mechanical casing can be realized on the top layer. The LO distribution network 42 to cater the two RF channel 39 can be realized in the middle layer. A power distribution circuitry 41 can be realized below the LO distribution network 42 in multi stack mechanical topology.
[0065] In an exemplary implementation, the components used can be bare dies and chips of ESD sensitive nature. PCBs involved are of 5/10 mil thicknesses Teflon substrate with tight etching tolerances, PTH and gold plating. Fabrication tolerances of 2 micro meter (um) for surface finish and 25 um for dimension has been maintained within the housing to meet the required frequency response. All the channels have been made identical to meet the amplitude and phase tracking requirements of the system.
[0066] In an exemplary embodiment, the circuitry of the proposed system as illustrated in Figs. 2 and 3 can be encased in an aluminum housing with proper channeling and partitioning in order to function properly in a wide band environment. Further, nine pin µD connector can be used to get the required voltages from the power supply module. Sufficient filtering can be provided in supply lines to suppress the noise in power supply lines. Four-hole small flange sub-miniature version A (SMA) connectors can be used for the RF and IF signals.
[0067] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGS OF THE INVENTION
[0068] The proposed invention improves phase non-linearity in a wideband homodyne receiver.
[0069] The proposed invention provides a system and method for improving non-linearity in a multichannel, wide Band, large dynamic range with better sensitivity homodyne receiver, without using any additional phase and amplitude controller circuitry.
[0070] The proposed invention provides a light weight and compact size system to improve phase non-linearity in a wideband homodyne receiver.
[0071] The proposed invention provides a homodyne receiver with improved phase non-linearity, having sufficient filtering to suppress noise in the receiver.