ps3_2011_FBA

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

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1 ECE 145a /218A problem set: resistive feedback amplifiers, device figures of merit, device power gains and cutoff frequencies. 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 m in d d g C R C / , 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 /( ~ d m in in R g C C and ) 1 /( ~ d m m m R g g g Problem 2: Analysis a simple resistively-loaded amplifier. The device has the following parameters: g m W m mS g / 1 m i g R / 5 . 0 25 ds m R g 0 gd C fF 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 g W , and find L R . Find the -3 dB amplifier bandwidth Problem 3: (218a only) compute the power-gain cutoff frequency of the transistor of
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This document was uploaded on 12/29/2011.

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

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