Using AC Analysis in Spice to measure the input/output impedance

[danda821]

Is there any way I can use AC analysis in Spice to measure the input/output impedance? Thanks.

 

[FvM]

measure input impedance ac analysis

Remember Z = V/I

 

[hbk2222]

ac analysis

u want measure the input impedance by putting 1V Ac and measure current drawn from it,and also for the output

 

[FvM]

ac analyi

measure the input impedance by putting 1V Ac and measure current

This results in an admittance measurement. For a direct impedance measurement, apply 1A IAC instead and measure the voltage drop.

 

[hbk2222]

what is ac analysis

it doesn't matter take the expression as u like it can give u admittance or impedance