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simulation opa question (Read 2583 times)

chungmnig Community Member Offline Posts: 37	simulation opa question Jun 20^th, 2006, 8:38pm Hi~~ when we design a SC-CMFB based opa often use PSS & PAC to analysis it gain & phase Margin. But when i take off the CMFB the phase Margin is smaller . My question is : when we use SC-CMFB ,the simulation is only care PAC & PSS , can neglect ac analysis ? thanks~~~!!!
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: simulation opa question Reply #1 - Jun 21^st, 2006, 6:11pm Chungmnig, How do you keep it to operate at right DC poing if you take off the CMFB? BG Yawei
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chungmnig Community Member Offline Posts: 37	Re: simulation opa question Reply #2 - Jun 21^st, 2006, 10:32pm ywguo wrote on Jun 21^st, 2006, 6:11pm: Chungmnig, How do you keep it to operate at right DC poing if you take off the CMFB? BG Yawei i take off CMFB and directly connect vcmfb to the opa node.
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: simulation opa question Reply #3 - Jun 22^nd, 2006, 10:04pm Chungmnig, The opa must not work if you put it in an open-loop when it is of high gain, although you try to connect vcmfb to opa node directly. Best regards, Yawei
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