Op-amp input capacitance

Dec 06, 2005 2 Replies

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

| 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 | I love to cook with wine. Sometimes I even put it in the food.

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



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

George

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