yishuihan
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Posts: 4
The Netherlands
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Hi Rakesh:
that's true there is a negative feedback loop via the degenerator (resistor or current source), quick conclusion would be the larger loopgain, the better linearity.
i realize my confusion might be the working conditon of the transistor. if the AC signal is samll, body effect is not a severe issue. for the large signal, the source will not track the gate voltage any more due to the dependence of the Vth on the Vbs.
anyhow, for the small signal, when Vbs is none zero, the equivalent gmb is paralled with others, loopgain will decrease more or less, thus the lineariy.
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