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Mixed-Signal (SOP) Design 217
Input Pi Output Pi
(a)
4
2 S11 >0 at 1.8 Ghz
Unstable
0
dB(S[1,1]) −2
−4
−6
−8
−10
10 1.5 2.0 2.5 3.0
Frequency (GHz)
(b)
FIGURE 4.62 (a) ADS model of LNA with mutual inductance. (b) Modeled S 11 result showing
instability.
