On Tuesday 21 September 2010, Chris Cole wrote:I get a normal sine wave output, but when the frequency increases, the wave changes considerably and starts to turn into a triangle wave...I'm not sure what I'm doing wrong, but this is strange.In the tran command (tran 10m 10 1) you asked it to strobe at 1 second intervals. So, no matter what the signal, you get samples 1 second apart. If you add "trace all" to the tran command you will see all of the samples, which should produce a smoother waveform. How it works is a throwback to when people actually looked at ASCII plots. It needs to change to make "trace all" the default, and have the strobe interval require a keyword "strobe" like spectre does. The actual time stepping is determined internally. There will be extra steps internally if needed to get a proper simulation, but they are not displayed unless you ask for them.
Even with the "trace all" added to my tran command: #!/bin/bash gnucap <<EOF build Vcc ( vin 0 ) sin offset=0. amplitude=24. frequency=60. r1 ( vin 0 ) 1.K list print tran v(Vcc) tran 10m 10 1 trace all > ac_test.gwave !gwave ac_test.gwave EOF rm ac_test.gwave I get a crazy waveform (attached) Chris
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