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sastry
Joined: 07 Apr 2007
Posts: 13
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 12 May 2008 18:59 AC analysis for differential amplifier in cadence |
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hi
i am trying to run ac analysis for differential input differential ouput amplifier in cadence.what is the setup for it
i have given ac magnitudes as 1 and offset voltages as 0.
the inputs are at phase difference of 180
and i am sweeping it for a frequency range.
is there anything else i should take care of
regards
sastry
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Usman Hai
Joined: 08 Apr 2004
Posts: 122
Helped: 1
Location: Canada
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| 12 May 2008 23:54 Re: AC analysis for differential amplifier in cadence |
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| It seems fine. Just make sure that you are also providing the common mode input to the opamp as well.
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sastry
Joined: 07 Apr 2007
Posts: 13
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| 13 May 2008 0:08 Re: AC analysis for differential amplifier in cadence |
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| what is common mode input for differential amplifier
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edge_tv
Joined: 29 Apr 2008
Posts: 23
Helped: 4
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| 13 May 2008 4:21 AC analysis for differential amplifier in cadence |
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| Common Mode is the Bias Voltage for the Input Transistors of th OP. You can use an Ideal_balun from the cadance Lib (analogLib) .You can set the commen mode and the diff. signal seperatly, (put into you simulation, port left up is the diff. signal and and port left down is the CM, on the right side you find the tow ports which goes to your amp). You can use the Balun also for the output, to seperat Diff signal and CM
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