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40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier

40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier

For very high precision low frequency applications, chopping the dc input signal to create an ac signal and then synchronously demodulating the signal to restore the dc value eliminates all static dc errors of the components used. This is a high gain (Av=1001) example with excellent low offset voltage and drift with temperature and very low noise suitable for demanding transducers such as those used in high resolution scales and in magnetic search coils.