For the first time, an exhaustive linear and nonlinear stability analysis of multi-transistors MMIC circuits is presented. A key point of the proposed stability analysis lies in that it can be easily implemented on any C.A.D. packages. Our straightforward and powerful approach allows both linear and nonlinear stability analysis of any complex circuit submitted or not to large R.F. signals. Following our novel approach, a MMIC HBT power amplifier was analyzed. Division frequency phenomena and spurious oscillations were detected by simulations and confirmed by measurements.
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