Vladislav D
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Posts: 76
The Netherlands
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The first stage is a common gate , the second is common drain. The AC current converted to a voltage at the source of M2 and amplified by CG stage. CD stage performs many function (like lowering output impedance, current amplification, level shifting, whatever) except voltage amplification. If ro_M1 >> Rd, the input impedance without feedback 1/gm1. Applying feedback, the impedance decreases even more by amount of Loop Gain. This is desirable since, the input source is current.
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