The circuit parameters for the diff-amp shown in Figure 11.32 are V+ = 1.8 V, V− = −1.8 V, and IQ = 120 μA. The NMOS transistor parameters are VTN = 0.3 V, kʹn = 100 μA/V2, (W/L)p = 8, and λn = 0.025 V−1. The parameters of the PMOS transistors are VTP = −0.3 V, kʹp = 40 μA/V2, (W/L)p = 10, and λp = 0.04 V−1. (a) Determine the small-signal differential-mode voltage gain Ad = vo/vd. (b) What is the maximum common-mode voltage gain that can be applied such that all transistors are still biased in the saturation region?
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