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thanks saro, I think what you say makes sense.
I design a single ended error amplifier as a cmfb circuit just like Razavi book describes, but I found that the dc point of differential out just about 50mv below my CM reference Voltage which is VDD/2. It seems the my cmfb circuit can not fix...
hi saro,
if I design a differential out amplifier, I use cmfb to surpress the common mode noise, do I also have to design bias circuit to fix the input dc point voltage?
miller opamp common mode feedback
the opam circuit is just copyed from Razavi book, there is not any tricky points relevant to my circuit. The opam is differential common two stage amplifier with miller cap compensation, and the cmfb use a error amplifier senses the dc point of opam...
common mode feedback
I design a full differentiall opamp with cmfb. It works well as an open loop amplifier, and there is no problem with PM and stability. But when I use it in a closeloop way to constitute a resisters feedback opamp, it can not work. I check the dc point of the input which...
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