Improvements in biasing and compensation of CMOS opamps

  title={Improvements in biasing and compensation of CMOS opamps},
  author={Sean Nicolson and Khoman Phang},
  journal={2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512)},
In this paper, we present modifications to the constant-gm bias circuit and the Miller-lead compensation technique which eliminate or minimize some of their shortcomings. First, we demonstrate how parasitic pad capacitance can cause instability in the constant-gm bias circuit, and show that the transconductance is constant only for specific bias conditions. Next, we suggest a new circuit topology that requires 75% less compensation capacitance to achieve stability. We also discuss problems with… CONTINUE READING
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