ps5_2011_unilateral - ECE 145a\/218A problem set Reactively matched ampliers mostly unilateral design Background Unilateral Device model We will assume a

ps5_2011_unilateral - ECE 145a/218A problem set Reactively...

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1 ECE 145a /218A problem set : Reactively matched ampliers: mostly unilateral design. Background: Unilateral Device model. We will assume a highly simplified device model as to the right, with g m W m mS g / 2 m i g R / 0 . 1 0 gd C fF g gs W m fF C / 5 . 0 g ds W m mS G / 1 . 0 Note that because of numerical problems in ADS, it may be necessary to add a nonzero gd C ; keep it small enough to not change the simulations ! Background:Bilateral Device model. g m W m mS g / 2 m i g R / 0 . 1 g gd W m fF C / 1 . 0 g gs W m fF C / 5 . 0 g ds W m mS G / 1 . 0 Problem 1: For the unilateral device model, compute by hand the maxium available power gain and the short-circuit current gain as a function of frequency. Problem 2: For a 50 Ohm generator and load, at a frequency of 50 GHz, and taking gW=100 microns for the unilateral device model, calculate the following by hand: insertion power gain, operating power gain, available power gain, maximum available power gain. Simulate these in ADS and compare with hand calculations.

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