Consider the BiCMOS diff-amp in Figure 11.44, biased at IQ = 0.4 mA. The transistor parameters for M1 and M2 are: Kn = 0.2 mA/V2, VTN = 1 V, and λ = 0.01 V−1 The parameters for Q1 and Q2 are: β = 120, VEB(on) = 0.7 V, and VA = 80 V. (a) Determine the differential-mode voltage gain, (b) If the output resistance of the current source is Ro = 500 kΩ, determine the common-mode voltage gain using a computer simulation analysis.
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