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I heard of the one where you mix the AC signal onto a DC voltage and pass it to the DUT using an amplifier. However, what if this is a wideband part? How do they even test the PSRR of 1 GHz + op amps?
I usually measure PSRR with the DC voltage applied to the DUT through a 50ohm resistor, and the AC voltage coupled in with coupling caps. However, this part I'm working with exhibits positive PSRR, when measuring it this way. I'm told that the Vcc pin needs to see a low impedance throughout...
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