Consider the fully cascoded diff-amp in Figure 11.37. Assume IQ = 80 μA and transistor parameters of: VTN = 0.8 V, kʹn = 60 μA/V2, λn = 0.015 V−1, VTP = −0.8 V, kʹp = 25 μA/V2, and λp = 0.02 V−1. The transistor width-to-length ratios are W/L = 60/4 for transistors M1−M4, W/L = 40/4 for transistors M5−M6, and W/L = 4/4 for transistors M7−M8. (a) Determine the output resistance of the diff-amp. (b) Calculate the differential-mode voltage gain of the diff-amp. (c) Find the common-mode voltage gain of the diff-amp using a computer simulation.
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