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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 449

Improved JFET op amp macromodel slews asymmetrically

Walt Jung

Abstract

The LT1056 improved JFET operational amplifier macromodel, which addresses slew rate asymmetry, is described.

Keywords

Operational amplifier

slew rate asymmetry

LT1056 macromodel

SPICE macromodels for op amps have been available for some time for both bipolar [1,2] and JFET [3] input stage device types. Interestingly, however, not much attention has been given to the models available to controlled slewing asymmetry. Dependent upon a given amplifier design topology, the large signal characteristics can have various degrees of slew rate (SR) asymmetry. It therefore makes sense to have models which emulate real IC parts in this regard.

A case in point is ...

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