ps6_2011_bilateral_design - ECE 145a\/218A problem set Reactively matched ampliers mostly bilateral design Background Unilateral Device model We will

ps6_2011_bilateral_design - ECE 145a/218A problem set...

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1 ECE 145a /218A problem set: Reactively matched ampliers: mostly bilateral 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 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 1a: Taking gW=100 microns for the bilateral device model, Plot the MAG/MSG stability factor K and B1 for the device of problem 1 vs frequency. At what frequencies is the device unconfitionally stable ? At a design frequency of 50 GHz, what is the maximum stable gain ? Calculate this by hand (!) and then compare to the ADS simulation. Problem 1b: Plot the device source and load stability circles at 50 GHz. What value of series resistance on the input would stablilize the device ? What parallel input resistance ? Repeat for the output. Problem 1c: Add series stabilization on the input so that the stablized MAG is 2 dB less than the transistor MSG at 50 GHz. Plot the input and output Ga and Gp circles at 50 GHz. Design matching networks at 50 GHz. Plot all 4 S-parameters vs frequency, and

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