This is a small signal problem. Suppose the MOSFETs drawn have ID=1 mA when VGS=2.5 V, and Vth=0.5 V. Suppose the BJTs drawn have IC=1 mA when VBE=0.7 V. (a) Derive voltage gain AV and input impedance Zin assuming RL→∞. (b) Plot AV as a function of RL assuming RL is attached between Vout and ground. (c) Rederive AV and Zin assuming RL→∞ and after swapping the BJT and MOSFET.
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