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ADS Tutorial Stability and Gain Circles ECE145A/218A
web.ece.ucsb.eduequations. The syntax is: gp_circle(S, gain, # points on circle) where S is the S-parameter matrix. Let’s illustrate. In the example below, a table is used to display frequency, maximum stable gain (MSG), the stability factor, k, and the magnitude of delta. The gain circles are at MSG (MaxGain1 in this case), and 1 and 2 dB below MSG.
Design of Low Noise Amplifiers - UC Santa Barbara
web.ece.ucsb.eduAvailable gain circles Device data sheets often plot GT on the ΓS plane under the assumption that the output is matched (ΓL = Γout *). This is the available power gain = GA . AVN A AVS P G P = Since output is always matched, and Γout depends on ΓS, G is independent of Γ . A L GA = S 2 1−S11ΓS 2 S21 2 1 OUT 2 (since ΓL =ΓOUT *)