Designer’s Guide Community

Pages: 1

How to do the stabilty analysis for this lock? (Read 3261 times)

dandelion Community Member Offline Posts: 98	How to do the stabilty analysis for this lock? Jan 24^th, 2007, 1:57am Hi, For the attached circuit, I hope to do some stabilty anlaysis,but I dod not know how to break the loop? Would anyone pls. shed some lights on it? Thanks
Back to top	lopp_analysis.GIF IP Logged

adesign Community Member Offline Posts: 73	Re: How to do the stabilty analysis for this lock? Reply #1 - Jan 24^th, 2007, 2:43am Probably you can try this: R and C are very high values
Back to top	lopp_analysis1.GIF IP Logged

dandelion

Community Member

Offline

Posts: 98

Re: How to do the stabilty analysis for this lock?
Reply #2 - Jan 24^th, 2007, 7:20pm

adesign wrote on Jan 24^th, 2007, 2:43am:

Probably you can try this:

R and C are very high values

Hi adesign,
It has risks with this method.

This is complex loop. You can not break it easily. The capacitor tied to the input and output for both amplifie. So, this cap has the miller efefct for both amplifier. If we break the loop as you mentioned. The miller cap will diaspperared for the 1st ampilfier. I have the concern the loading effect will afffect the simulation accuracy.

Regards

IP Logged

Andrew Beckett

Senior Fellow

Offline

Life, don't talk to
me about Life...

Posts: 1742
Bracknell, UK

Re: How to do the stabilty analysis for this lock?
Reply #3 - Jan 26^th, 2007, 6:19am

There are many discussions on this forum about stability analysis. Spectre has an analysis (which improves upon Middlebrook's method) for analysing stability withing requiring you to break the loop(s). Loading is correctly handled as a result using stb analysis. You should find a number of postings about this by using the Forum's search facility.

Regards,

Andrew.

IP Logged

Pages: 1

‹ Previous topic | Next topic ›