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Op-amp input capacitance

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

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
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Reply to
Jim Thompson
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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

Reply to
George

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

George

Reply to
George

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