Using Spectre RF to perform stability analysis for circuits with periodically time-varying operating points.
The PSTB (periodic stability) analysis feature in Cadence Spectre RF Simulation Option performs stability analysis for circuits with periodically time-varying operating points. PSTB is the periodic equivalent of linear stability (STB) analysis in that it calculates the small-signal loop gain, gain margin, and phase margin around a periodic operating point. PSTB is useful in applications such as power amplifiers and oscillators, where linear stability does not apply due to the nonlinear nature of the circuits.
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