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How to build amp's open loop gain simulation circumstance? (Read 1926 times)
bitplex
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How to build amp's open loop gain simulation circumstance?
Oct 08th, 2016, 6:05am
 
Hi all.
A simple question from a freshling.
How to build an amp's open loop gain simulation circumstance?
for eg.
xi0 gnd inn inp out vdd amp
r1 inn out 1g
c1 inn gnd 1g
vinp inp 0 2.5 ac 1
It works, I don't know if there are another way to get this. Thank you.
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buddypoor
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Bremen, Germany
Re: How to build amp's open loop gain simulation circumstance?
Reply #1 - Oct 8th, 2016, 8:09am
 
bitplex wrote on Oct 8th, 2016, 6:05am:
.............
xi0 gnd inn inp out vdd amp
r1 inn out 1g
c1 inn gnd 1g
vinp inp 0 2.5 ac 1
It works, I don't know if there are another way to get this. Thank you.



Can somebody translate, please?
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LvW (buddypoor: In memory of the great late Buddy Rich)
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Ken Kundert
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Silicon Valley
Re: How to build amp's open loop gain simulation circumstance?
Reply #2 - Oct 9th, 2016, 1:24pm
 
The approach you are taking, using a low pass filter to break the loop, is not accurate. You should use Spectre's STB analysis.

There has been plenty of discussion of loop gain analysis and stb analysis on this forum. Look around for more detail.

-Ken
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