There is an oscillator part in my circuit. The pulse signal generated by the first ring oscillation part has a width of about 31us.
Using this oscillator, some oscillation signals are subsequently generated with a period of about 62us,
which is used back into the amplifier part. I want to know how to set it during pss simulation, and whether the input port needs to set a frequency. Should I choose shooting or hb, which one should I choose as the oscillation pin, and how to determine the beat frequency. I have set it up many times but it still shows variance errors. I am a newbie looking for help. Thank you very much.