The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Aug 24th, 2019, 9:48am
Pages: 1
Send Topic Print
PSS converg. error on adding capacitor unit to cap-bank in Ring oscillator (Read 1116 times)
subtr
Community Member
***
Offline

Analog Enthusiast

Posts: 59
India
PSS converg. error on adding capacitor unit to cap-bank in Ring oscillator
Mar 06th, 2017, 9:18pm
 
I have a pseudo differential ring oscillator (where there are two ring oscillators with coupling creating a differential output) in the output of which I have a few capacitor banks to change frequency. If I had just connected 3 LSB banks, I see no issue with convergence. But the moment I add the next bits corresponding the higher cap values, I see that the pss does not converge. Anyone has faced any similar error where a unit in capacitor bank caused a pss convergence failure.
Back to top
 
 

Regards
Subtr
View Profile   IP Logged
Ken Kundert
Global Moderator
*****
Offline



Posts: 2211
Silicon Valley
Re: PSS converg. error on adding capacitor unit to cap-bank in Ring oscillator
Reply #1 - Mar 8th, 2017, 9:51am
 
Are you sure the two oscillators are oscillating as one? Are the waveforms truely periodic?

-Ken
Back to top
 
 
View Profile WWW   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2019 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.