ps3_2011_FBA - ECE 145a\/218A problem set resistive feedback amplifiers device figures of merit device power gains and cutoff frequencies Problem 1

ps3_2011_FBA - ECE 145a/218A problem set resistive...

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1 Problem 1: Degeneration relationships. RC parallel emitter or source degeneration is used to reduce by equal amounts the device input capacitance and transconductance. Assuming that inddgCRC/, compute the Y-parameters of the circuit in the center and the circuit to the right, showing that the 2 networks are equivalent if )1/(~mininRgCCand )1/(~dmmmRgggProblem 2: Analysis a simple resistively-loaded amplifier. The device has the following parameters: gmWmmSg/1migR/5.025dsmRg0gdCfF f=300 GHz. In a 50 Ohm system, at low frequencies the amplifier is to have 10 dB insertion gain S21, and zero S11 and S22. Find the FET gate width gW, and find LRFind the -3 dB amplifier bandwidth m d .

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