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How do we calculate an amp's input and output impadance?
How do we calculate an amp's input and output impadance?
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Old 13th January 2003, 10:07 PM   #1
Bricolo is offline Bricolo  France
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Default How do we calculate an amp's input and output impadance?

According to the shematic, not with measurements


thanks
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Old 13th January 2003, 10:26 PM   #2
uli is offline uli  Austria
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Default 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
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