1. PSS: periodic steady-state
Using Harmonic balance (in the frequency domain): 1)simulating weak non-linear circuits; 2) handling frequency dependent components
or shooting (in the time domain): highly non-linear circuits with sharply rising and falling signals;
Determining the periodic oeperating point for the circuit, which can be later used for PAC, PXF, PNOISE, or PSTB.
1.1 Application
Autonomous circuit: like OSC (specify a pair of nodes p and n; specify an estimate of teh osc period)
Driven circuit: like amplifiers, filters, and mixers (specify the analysis period or fund freq)
1.2 Two phases
1) Initial transient phase: initialize the circuit
a. 1st interval: tstart ---> tonset (onset of periodicity, min time for all sources are periodic)
b. 2nd interval: optional user-specified stabilization interval, length tstab
c. 3rd interval: one period f