Consider the MOSFET diff-amp with the configuration in Figure P11.33. The circuit parameters are V+ = 3V, V−= −3 V, and IQ = 0.2 mA. The transistor parameters are VTN = 0.4 V, kʹn = 100 μA/V2, W/L = 10, and λ = 0. The range of the common-mode input voltage is to be −1.5 ≤ vcm ≤ +1.5 V, and the common-mode rejection ratio is to be CMRRdB = 50 dB. (a) Design the diff-amp to produce the maximum possible differential-mode voltage gain, (b) Design an all MOSFET current source to produce the desired bias current and CMRR. The minimum W/L ratio of any transistor is to be 0.8, and assume λ = 0.02 V−1 for all transistors in the current source circuit.
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