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  1. #1
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    characterizing operational amplifier

    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,

    •   Alt25th July 2007, 11:15

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  2. #2
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    characterizing operational amplifier

    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.



    •   Alt25th July 2007, 12:01

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  3. #3
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    characterizing operational amplifier

    dear analog_prodigy

    Do you know another method at the spectre?



    •   Alt26th July 2007, 03:38

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  4. #4
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    characterizing operational amplifier

    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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