characterizing operational amplifier

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wonbef

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hi,all,

how to simulate and measure the input/output impedance of operational amplifier. pls give me some methods. can you give me some papers about analysis and simulation of operational amplifiers. thanks in advance!

kind regards,
 

in spice code, give the command .op and .tf (transfer function) of output voltage.
u can see the input and output impedances seen in the output listing file.
 

dear analog_prodigy

Do you know another method at the spectre?
 

in spectre, maintian the DC input level and add a ac current at the output node, run ac simulation and get the ac voltage magnitude of the output node, the output resistance is equal to the ac voltage magnitude devided by the ac current, if the ac current is set to be 1A, then the output resistance will just be equal to the ac magnitude.
 

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