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PSS + PNOISE simulation（PFD + Charge Pump）

JG202412161044

Hi.

In my PLL PFD + Charge Pump simulation, I control the output current of the charge pump by inputting two 100 MHz switching signals. I use PSS + PNOISE simulation to analyze the noise of the output current. The PSS beat frequency is set to 100 MHz. My question is, how should the sweeptype for PNOISE be set? Should it be default or relative=1? When I set it to relative=1, the output noise at a 100 Hz frequency offset worsens by 8 dB.

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