A Novel Architecture Of Readout Front End For Cardiac, Visual And Neural Signals.

Abstract: The application is an analog readout front end for bio-potential acquisition systems, that is capable of processing electrocardiogram (ECG), elecfroratinogram (ERG) and all kind of neural signals that are electroencephalogram (EEG), elecfrocorticogram (EcoG) and electroneurogram (ENG). The output of this analog readout front end is ready to feed the subsequent stages that are analog-to-digital converters (ADCs) and digital signal processors (DSPs). The system consists of a pre-amplifier that amplifies the signals that are acquired from human body through electrodes. Along with preamplifier it has a high-pass and low-pass filter that forms a band-pass filter to reject the out of band frequencies and amplification purpose. It is a multifimctional read out front end that has a variable bandwidth to accommodate above mentioned bio-signals. It consumes minimal power of 150 fxW so it can be easily incorporated in the portable bio-signal recording/processing systems. The small value of input referred noise of 34.46 insures amplification of in-band signals and rejection of out of band signals without degrading the signal quality. The system is current mode front end so it includes advantages co current mode circuits like low impedance and low voltage swing at internal nodes, it makes the operation simpler at such low supply voltage. The current mod topology enables us to operate the system under low power consumption with minimal added noise.

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