Abstract We propose here an efficient algorithm for finding the steady‐state response of stiff non‐linear circuits. It is based on a frequency‐domain relaxation method and can be applied efficiently to obtain the steady‐state waveforms of both periodic systems and multi‐frequency‐component systems. the solution at each iteration is obtained by solving an associated linear time‐invariant circuit at every frequency component via modified nodal analysis. Our algorithm is very simple and can be applied efficiently to solve a large class of practical non‐linear communication circuits which are notoriously stiff and hence rather time‐consuming to solve with existing methods.
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