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The noise level of various monolithic zero-drift amplifiers was measured. Excess current noise was observed that significantly exceeds shot noise calculated from the input bias current. The parameter dependence of the excess noise was studied with a basic chopper realized with discrete components. A linear dependence of the current noise density on the chopper’s load capacitance was found. Guided...
A basic model for excess current noise in amplifiers with switched input is presented. Thermal noise in the input switches causes charge fluctuations in the amplifier input capacitance with a bandwidth much higher than the switching frequency. This wideband charge noise is undersampled by the switching process, leading to excess current noise with a spectral density proportional to temperature, capacitance...
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