Keysight Technologies, Inc.
Method of determining gain and phase margins and analyzing stability of nonlinear RF circuit

Abstract:

A method executable by a computer processor is provided for determining stability of non-linear radio frequency (RF) circuit. The method includes identifying key devices of the RF circuit which open feedback loops when turned off; defining a generalized Bode's return ratio matrix with respect to the key devices over a range of small signal frequencies at a large signal operating point; determining stability margins for gain and phase of the RF circuit based on eigenvalues of the Bode's return ratio matrix; and determining overall stability of RF circuit using the Nyquist locus of a normalized determinant function based on the determinant of the generalized Bode's return ratio matrix.