PSS and PNoise

Analog4Fun

已于 2022-05-06 05:22:23 修改

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于 2022-04-24 12:01:30 首次发布

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本文介绍了周期稳态(PSS)分析，用于模拟非线性电路的周期性稳定状态，适用于振荡器和受驱动的电路。PSS包含两个阶段：初始瞬态和求解周期稳态。另一方面，PNoise分析考虑了频率转换效应，适用于预测混频器和开关电容滤波器等电路的噪声行为。PNoise分析有两种类型：时间平均噪声和抖动采样噪声。

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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