I just downloaded and started using simetrix last week.
I read the tutorial. But I still can't get the AC simulation right.
The amplitude vs. freq plot shows zero amplitude.
The circuit I am trying to simulate is a comparator (with reference voltage and hysteresis). seeattachment.
When you do an AC analysis you need at least one voltage source to have 'AC 1' for its parameters, or some other value. However, you cannot measure a comparator's hysteresis with an AC analysis - you need to use a DC or Transient analysis.
When you do an AC analysis you need at least one voltage source to have 'AC 1' for its parameters, or some other value. However, you cannot measure a comparator's hysteresis with an AC analysis - you need to use a DC or Transient analysis.
I am not trying to measure the hysteresis with AC analysis. I just want to do an AC analysis and look at the Vout Vs freq plot.
Can you explain the AC_1 parameter?
Do you mean an AC voltage source?
I thought the waveform generator was good enough.
You won't get a sensible AC plot from a comparator. AC analysis is small signal - a comparator operates in large signal mode.
For an AC analysis you need a voltage source like your V3 not a waveform which is only for Transient analysis. If you edit V3 (click on it & hit F7) you will see an option to enable the AC source. If you do that (with a magnitude of 1) then you will see V3 7 0 AC 1 DC 330m appear in the netlist, or something similar.