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Engineering
Electrical Engineering
How do you analyze this circuit
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[QUOTE="yungman, post: 6098787, member: 131028"] I think you are right, When I reduce R21 to 500ohm, R21//3 =333ohm and theoretical gain is 61. I got about 56 in the simulation mainly because of low loop gain that cause error. I tried R21= 1K, I got gain about 40. The theoretical gain is 41. Looks like my idea works, just calculating the gain wrong. I did not think of the output of U6 should be considered as ground. ThanksEDIT: if this is the way I look at this, then the internal gain of U6 should be R21/(R3//R6). that is in the schematic gain of U6 is 10K/(1K//20K)+1= 10K/0.9524K+1=11.5. So I add about 21.2dB of loop gain. 56+21=77dB of loop gain is respectable. THD should be low enough. That's great. Alan [/QUOTE]
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How do you analyze this circuit
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