In this paper, we describe a high precision and low power capacitively-coupled chopper instrumentation amplifier (CCIA) for DC measurement application. A positive feedback loop (PFL) is implemented and analyzed to boost the input impedance. Also a tec...
In this paper, we describe a high precision and low power capacitively-coupled chopper instrumentation amplifier (CCIA) for DC measurement application. A positive feedback loop (PFL) is implemented and analyzed to boost the input impedance. Also a technique to remove a Wheatstone bridge sensor’s offset is implemented and introduced in this paper. The circuit is designed in a 3V 0.13 μm CMOS process, and designed sensor’s offset cancellation range is 256mV with 2mV LSB. High gain accuracy and 3 μVrms input referred noise is achieved and these are verified with simulation.