engineerme
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Hi LvW,
Cheers. I thought thats what i did, the original gain was at 20dB (op-amp 1 set this already) to obtain a GM of -7.6dB, so a total gain of 27.6dB would create stability.
I am sorry, but the circuit you have shown us contains no lowpass with a gain of 10. The 1st lowpass (opamp 1) has a gain of 24.2.Hi,
Right ok sorry its op-amp 2, 20dB is from the first active low pass filter (100k/10k).
I found that after implementing the GM and reaching the stability limit, the unity gain does not lie at the same frq. as my 180 deg phase response when i run the AC analysis again.
My initial question relates to this, how can i show that my odB gain runs through 180 dB on a closed loop system? can it be done with AC analysis or is there a closed loop technique other than seeing the step response.
Dunk
variable gain block.
Interesting. How would you block gain? i can understand that having variable gain in a system would be beneficial, as the best i could get was two decimal places by adding the exact GM onto the previous system.
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