Question

Draw the circuit of a common source amplifier, which is biased by a MOSFET current mirror, and which uses only one capacitor and two resistors (including the RREF of the current mirror). Assume that the input to the amplifier is a zero-DC signal. Then, design the amplifier to achieve a gain Avo--gRo =-4V/V, and an output resistance Ro-Ro-1K. Ignore channel modulation. Assume that all MOSFETS are identical with VIN-1V, and Kn = 2mA/V. Use Vo = 5V and Vs =-5V. Also, gm2-2Knlo, and also for saturation ID = ½ Kn(VGS-VIN)2 Check if your design is valid. What is the input resistance of the amplifier?

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