diezclos11
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I am designing a common mode feedback circuit for a folded cascode amplifier. However, I have a doubt regarding the noise that this circuit will introduce. As it is injected in Vcmfb, ideally all the noise would be seen as common mode noise. However, If the transistors M10 and M11 are not perfectly matched, there will be some noise introduced into the system. I would like to have the analytical expression of that noise referred to the input. If I account for a % of missmatch for the transistors would then the noise be derived as follows?.
Vin_CMFB=sqrt(((NOISE_CMFB))*(gm_top^2/gm_ota^2)*MISSMATCH);
Vin_CMFB=sqrt(((NOISE_CMFB))*(gm_top^2/gm_ota^2)*MISSMATCH);