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how to simulate output impedance of cascode

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mickey0908

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cascode impedance

Hi everybody！
how to simulate the output impedance vs frequency curve of cascode current mirror using hspice?

ths
 

cascode output impedance

mickey0908 said:
Hi everybody！
how to simulate the output impedance vs frequency curve of cascode current mirror using hspice?
ths
Click to expand...

Independent on the simulator type the best way to simulate an output impedance is to inject an ac current of 1 A into the output and measure the voltage which then is identical to the impedance itself. Don´t be afraid of saturation effects (due to the high current) since the ac analysis is a pure linear analysis and the characteristic always is linearized around the bias point.
 

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    mickey0908

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how to simulate output impedance

thanks
 

output impedance of current mirror in hspice

Hi LvM,

I used the method that you told.using Hspice to sim:
for example:
i0 out 0 0.5u ac=1(0.5ua is static point, through tran simulation)

If change the 0.5uA to 0.50001uA(because of process change), the output impandence will change a lot.
 

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