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Design >> Analog Design >> PSRR for OScillator using PXF
https://designers-guide.org/forum/YaBB.pl?num=1108654330

Message started by ic_engr on Feb 17^th, 2005, 7:32am

Title: PSRR for OScillator using PXF
Post by ic_engr on Feb 17^th, 2005, 7:32am

I ran PSS and PXF for my oscillator. I shose sweeptype as absolute with f=1Hz to 10MHz.

After completion of PXF, the PXF form assks me for selecting the Vsource. I selected the VDD source. It gave me a plot from 0 to 10MHz. Is this the frequency of the VDD from DC to 10MHz or is it harmonic of the oscillator.

The PSRR output shows 40dB at 1Hz and goes dwon to 0 at ~1kHz. from 2kHz to 10MHz it stays flat at ~-3dB.

Can some one explain me what all this is.

What does 40dB reflect in terms of change in frequency of fundamental being 4MHz.

I will appreciate your help on this matter.

Also do I have to select Modulation in the PXF form.

Thx

ic_engr