The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> how to simulate loop gain for mulitiloop using stb?
https://designers-guide.org/forum/YaBB.pl?num=1378277275

Message started by 880321 on Sep 3^rd, 2013, 11:47pm

Title: how to simulate loop gain for mulitiloop using stb?
Post by 880321 on Sep 3^rd, 2013, 11:47pm

Hi;

I want to simulate the loop gain in a bandgap circuit with an amp, I can put a dc voltage to break the loop in three place:
1. positive input of the amp(negetive feedbak);
2. negetive input of the amp(positive feedbak);
3. the output of the amp;

in the above cases, which is the right configuration?

BTW, if I want to get the positive loop gain and negetive loop gain seperately , how can I use stb?

Title: Re: how to simulate loop gain for mulitiloop using stb?
Post by raja.cedt on Sep 4^th, 2013, 5:48am

By breaking the loop at single point you have make sure you break all the feedback, so output of opamp is the rite point.

Up to my knowledge you can't have individual loopgains...

Thanks,
Raj.