How do we calculate an amp's input and output impadance?
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 13th January 2003, 10:07 PM #1 Bricolo   diyAudio Member     Join Date: Nov 2002 Location: Grenoble, FR How do we calculate an amp's input and output impadance? According to the shematic, not with measurements thanks
 13th January 2003, 10:26 PM #2 uli   diyAudio Member   Join Date: Dec 2002 Location: Vienna, Austria calculating Hi, assuming we´re talking about MOSFET amplification I would calculate as follows: Input impedande of a non inverting input is about the value of the input resistor to ground, as the fet´s input impedance is that high that you need not take it into account in real life. Inverting input with feed back: about the amount of the series resistor in the signal path, as the input impedance of the DUT is about zero. Output: A bit complicated but I do it like this: On resistance of the FET plus Source resistor plus Outputimpedance of the power supply divided thru the amount of feedback (open loop amplification´thru closed loop amplification. Uli __________________ 'Jazz is not dead, it just smells funny' F.Zappa

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