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output resistance of opamp

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avinash

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how to simulate for output resistance of opamp through spice.
 

avinash said:
how to simulate for output resistance of opamp through spice.
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Just connect an AC voltage source to the output and measure the current in that source. The resistance is V/I in any analysis AC or DC or Tran.

You can sweep that source and check the resistance for diferent output voltages.

Bastos
 

dear bastos ,
where i should connect the +ve and -ve inputs.
 

when you do AC sweep,you can put a very larg compacitor to the output in parallel to measure the shortcircuit current.And then measure the output voltage without load.using v/i you can get resistance of op
 

avinash said:
dear bastos ,
where i should connect the +ve and -ve inputs.
Click to expand...

Use the feedback network of AC analysis (large resistors and capacitors) to do not load the output.

Bastos
 

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