PSS and PNoise

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