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Simulating Oscillator-Avoiding 'no convergence error'

Question asked by t_clifford on Nov 10, 2014
Latest reply on Nov 11, 2014 by t_clifford

As an exercise I have tried to simulate a simple oscillator made from two cross coupled transistors using Hyperlynx Analog. A simple circuit which clearly does work in practice but I just cannot get it to oscillate consistently in simulation. I am trying to do time-domain transient analysis up to 200mS. In practice it oscillates at approx 33Hz. In various attempts to kickstart the circuit I have tried using a pulse power supply instead of DC power. I have also tried initial conditions on the capacitor voltages and injecting a damped sine wave into the transistor base to give it a noise kick. Most of the times the circuit refuses to oscillate, other times I get a frustrating ‘no convergence error’ .Does anyone have advise on dealing with ‘no convergence errors’ . On how to identify the cause or avoid getting them.

Are there any other tips/tricks to kick-starting such a circuit?

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