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Op-amp input capacitance

G

George

Hello,

Is there any way to estimate the input capacitance of an op-amp (say the
TL082) in unity gain, voltage follower mode? A friend estimates it as
about 12 pF based on some transient voltage lab tests. I couldn't find
any info about this on the TI data sheets, unless I missed it.

Also, does the Pspice op-amp model for the TL082 include input
capacitance? My guess is that is does not.

George
 
J

Jim Thompson

Hello,

Is there any way to estimate the input capacitance of an op-amp (say the
TL082) in unity gain, voltage follower mode? A friend estimates it as
about 12 pF based on some transient voltage lab tests. I couldn't find
any info about this on the TI data sheets, unless I missed it.

Also, does the Pspice op-amp model for the TL082 include input
capacitance? My guess is that is does not.

George

If it's a DIP, it's about 4pF per pin... almost all of it package
related, NOT on the chip itself... chip pad is probably ~100fF.

...Jim Thompson
 
G

George

Jim said:
If it's a DIP, it's about 4pF per pin... almost all of it package
related, NOT on the chip itself... chip pad is probably ~100fF.

...Jim Thompson

It's a DIP. The 4 pF sounds reasonable. Thanks for the info.

George
 
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