A Comprehensive Analysis of the Noise Power of Three-Stage OTAs in Switched-Capacitor Circuits

In this paper, a comprehensive analysis of the noise power of three-stage amplifiers is presented. It is found that the noise power of each stage at the output of the amplifiers, depending on the type of compensation structure, could have different conditions. In some of the three-stage amplifiers, because of the compensation structure, the noise power contribution of the first stage is dominant, and in others the noise power contribution of the second stage. To demonstrate the validity and the correctness of this analysis, the reversed nested Miller compensation (RNMC) and the damping factor control frequency compensation (DFCFC) amplifiers are designed in a 90 nm CMOS technology using HSPICE and circuit-level simulation results are provided, which show, for the RNMC and DFCFC amplifiers, the first stage and second stage noise contribution is dominant, respectively.

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