ACWWong
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Hi nxing, when you say "differential source follower" do you mean two source followers which are differentially driven ? If so, the standard technique is to average the output signals by taking the centre-point of two resistors connected between the outputs, and using this in a feedback loop to control the common-mode levels into the source follower gates. This is covered in several textbooks, such as Razavi's "Design of Analog Integrated Cricuits" section 9.6.
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