# Problem 1:...

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1 ECE 145a /218A problem set: Bilateral Reactively matched ampliers and stability. Problem 1: g m W m mS g / 0 . 1 m i g R / 0 . 1 g gd W m fF C / 2 . 0 g gs W m fF C / 0 . 1 g ds W m mS G / 1 . 0 part a) Taking g W =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 20GHz, what is the maximum stable gain ? Calculate this by hand (!) and then compare to the ADS simulation. part b) Plot the device source and load stability circles at 20 GHz. What value of series resistance on the input would stablilize the device ? What parallel input resistance ? Repeat for the output. part c) Add series stabilization on the input so that the stablized MAG is 2 dB less than the transistor MSG at 20 GHz. Plot the input and output Ga and Gp circles at 20 GHz. Design matching networks at 20 GHz. Plot all 4 S-parameters vs frequency, and compare the peak S21 obtained to the transistor MSG.