A low noise, low offset instrumentation amplifier with chopper stabilization is presented. The equivalent input noise and offset is reduced using the technique of chopper stabilization with a chopping frequency of 100kHz. The channel charge injection is cancelled by the symmetrical circuit topology. With the wide swing bias circuit design, the amplifier achieves a very high power-supply-rejection ratio (PSRR), and it is operated at a single supply voltage of 5V. The instrumentation amplifier is simulated using TSMC 0.35-μm CMOS technology. It achieves an input-referred noise voltage of 345nV/(Hz){sup}(1/2) @ about 1kHz, which is not very good for μV level signal processing because of the large thermal noise parameter of the process model.
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