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Deviations from the (4 RC)1/2 law require adjusted noise calculations for nonwhite noise; leaves open experimental validation across amplifier settings.
A lock-in amplifier can be considered to be a special case of the more general box-car averager. Expressions for the output noise voltage of lock-in amplifiers are deduced from the corresponding results derived earlier for box-car averagers. Deviations from the simple (4 RC)1/2 law are shown to exist in the case of nonwhite noise.
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Neelakantan et al. (1980) studied this question.
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