Noise analysis of a continuous-time auto-zeroed amplifier

The effect of auto-zeroing on the internal noise of a continuous-time auto-zeroed amplifier is analyzed and a set of empirical expressions are developed which predict the important aspects of its noise shaping behavior. The dependence of the output noise power spectral density on the auxiliary signal path gain, nulling amplifier bandwidth, and auto-zeroing clock frequency are all demonstrated. The results are confirmed experimentally.