The proposed inverter-based chopper instrumentation amplifier achieves low input referred noise with very low power consumption, demonstrating potential for micropower ECG applications.
Simulation of micropower ECG amplifier shows promise; leaves open translation to silicon and clinical validation.
This paper proposes a low-power inverter-based chopper instrumentation amplifier (IA) for ECG applications. A capacitively-coupled topology with chopper is employed while a two-stage inverter-based amplifier serves as the gain stage. Pseudo resistors are introduced to stabilize the output common-mode voltage of the amplifier and an improved switch-capacitor integrator with resistive attenuator is designed for the DC offset canceling (DCOC) loop. The instrumentation amplifier is implemented in a standard 0.18μm CMOS process. Simulation results show that the input referred noise is 1.28 μVrms ranging from 1Hz to 110Hz while consuming 192nW with a 1.2V supply.
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Wang et al. (2014) studied this question.
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