Up to here, only forced circuits were dealt with. That is, the
above-mentioned methods can analyse circuits that are driven by
signal sources, but do not create a signal by themselves. The
typical examples are amplifiers and mixers. However, harmonic
balance techniques are also capable of simulating autonomous
circuits like oscillators.
This is mostly done in the following way:
- The user enters an approximate frequency, where the oscillation
is expected. (An ac simulation can be performed to get an idea about
- The user enters a frequency interval. Somewhere within this
interval the oscillation must appear.
- The user specifies a circuit node where the oscillation voltage
can best be measured.
- The simulator performs several harmonic balance analyses with
different fundamental frequencies in search for the oscillation.
This document was generated by Stefan Jahn on 2007-12-30 using latex2html.