Consider the diff-amp in Figure P11.68. The PMOS parameters are: \(K_{p}=\) \(80 \mu \mathrm{A} / \mathrm{V}^{2}, \lambda_{p}=0.02 \mathrm{~V}^{-1}, V_{T P}=-2 \mathrm{~V}\). The NMOS parameters are: \(K_{n}=80 \mu \mathrm{A} / \mathrm{V}^{2}, \lambda_{n}=0.015 \mathrm{~V}^{-1}, V_{T N}=+2 \mathrm{~V}\).

(a) Determine the opencircuit differential-mode voltage gain.

(b) Compare this value to the gain obtained when \(R_{1}=0\).

(c) What is the output resistance of the diff-amp for parts (a) and (b)?

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R = 1 k V+= 10 V R = 1 k M3 M4 M M2 +1=0.2 mA Figure P11.68 V-=-10 V