Thanks ill take a look, but the rest of Ridleys book explains it.The page linked in post #12 shows a voltage injection setup, but doesn't actually explain the method. You better read Middlebrook's article "Measurement of loop gain in feedback systems"
Which closed loop gain? The set point transfer function? It isn't of much interest for a fixed set point. Load response (= complex output impedance) and response to input voltage variations are probably more important. But they all depend on open loop gain.I suppose the hanging question now for all of us, is, how to get the closed loop gain, and why one as a PSU designer, would want it, when one already has measured the open loop gain.
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