A Low-Noise Programmable Chopper Current-Feedback Instrumentation Amplifier
To address the low-frequency noise interference issue in programmable gain instrumentation amplifiers(IAs)for sensor AFEs,a low-noise programmable gain chopper current-feedback IA is designed.The design employs chopper technology to suppress low-frequency noise,exemplified by 1/f noise.A digital-to-analog converter(DAC)is incorporated to implement sensor offset compensation using current stacking,resolving the issue of performance degradation caused by sensor offset.A programmable resistor network is employed to achieve programmable gain amplification,enhancing the IA's versatility.The IA is based on TSMC's 0.18 μm process,with a supply voltage of 2.7～3.6 V.By adjusting the resistor network,a gain of 16～2048 can be achieved.Additionally,it is also ideal in sensor offset compensation range and equivalent input reference noise parameters.
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