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Transient convergence issue

h1jo2d3put4

 Hello everyone,

I'm new in this forum and a newbie using cadence. I've been trying to simulate an oscillator circuit using transient, but the simulation never converged. I started reducing the size of the circuit until I ended up with circuit shown in the picture attached. It is actually a transient simulation with all the default parameters with a simulation time of 1 ns. The simulation crashes after a few fs for the liberal or conservative error setting and takes ages to run until it eventually crashes for the moderate option. 

Any comments and/or suggestions will be much appreciated.

 Regards,

 

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  • I tried constructing the same circuit and it didn't "crash" for me (I assume you meant it stopped with the blow up error you showed in your image, rather than crashing) - but I was having to guess what some of the parameters are. Best to post the input.scs .

    However, I guess your circuit does not really have a 1 Farad capacitor in it? Large ideal component values can be problematic... I suspect the circuit is unstable (maybe try running a pz analysis to look for RHP poles).

    Andew.

Reply

  • I tried constructing the same circuit and it didn't "crash" for me (I assume you meant it stopped with the blow up error you showed in your image, rather than crashing) - but I was having to guess what some of the parameters are. Best to post the input.scs .

    However, I guess your circuit does not really have a 1 Farad capacitor in it? Large ideal component values can be problematic... I suspect the circuit is unstable (maybe try running a pz analysis to look for RHP poles).

    Andew.

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