Saturday, 30 June 2018

Common source circuit with current source and diode connected load


Could anyone explain why the output bias voltage of the common source in figure a is not well defined and needs a common mode feedback while the circuit in figure b is well defined?


Here is what I have so far. For the circuit in figure a. When the bias current changes a bit, Vout changes a lot. However, how to explain the same thing for figure b?


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