Hi, During power down the amplifier will go high impedance. If there is a signal present at the inputs it is possible you will still see some of that signal on the output as it feeds through the feedback network around the amplifier. However, the amount of signal that feeds through should be fairly small. I checked on the SPICE model and it does only show a small amount of feed-through. Could you check the text of the SPICE model file you are using and let me know what version it says? The latest is version 2.0. Thank you, Jacob
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