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Subject: Is LM833 SPICE Model Accurate?

Date: 07/31/02 at 11:37 AM
Posted by: Dale
E-mail: dchisholm@coinco.com
Message Posted:

I'm looking at the SPICE macromodels (from both National and ON Semi) for the LM833 dual opamp . . .

And I see the models call out N-channel JFETS for the input pair . . .

But the datasheet "equivalent schematic" (and the mfgr's description) says it uses PNP bipolars.

How accurate IS this model, anyhow? (Yeah, I know that macromodels don't even try to duplicate everything inside the IC - but if we're gonna use something similar to the Boyle macromodel architecture, it seems like the input pair should be the same type of device as the actual IC.)

Dale Chisholm
Analog Artisan, Coin Acceptors Inc.

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