PAC/PSS analysis

1. Input signal

Input signal is set to be DC.

Input signal for PAC analysis

2. Clock signal (fundamental frequency)

Ideal clock generator should be only one. If we need more tan one clock signal, they should be derived from the main source:

Clock generator for PAC analysis

3. PSS analysis setup

Fundamental Tones should have only one frequency. Beat Frequency should equal to the sampling frequency. Additional Time for Stabilization – time required for the circuit to achieve normal region of operation.

PSS analysis setup

4. PAC analysis setup

Fill in frequency range and the required frequency step. Sidebands should be 0.

PAC analysis setup

5. Printing out the results

Select Results → Direct Plot → Main Form. Then select PAC tab and select required parameters.

PAC analysis result

6 Click on a desired node to plot

P.S. We will see some artefacts near the sampling frequency, which is normal and makes complete sense

Written by: Ivan Smirnov