Re: Opamp Offset voltage problem

Eeyore wrote:

amy_burton2007@xxxxxxxxx wrote:

Hi! I want to measure the offset voltage of an opamp.

It's a variable !

Modelling serves no purpose here - other than you entering a value - but then
you know what it is anyway !.


Modeling might serve the purpose of checking out a measurement method, since the actual offset value is known, beforehand.

Amy, most practical offset measurement methods make use of the gain of the amplifier to amplify the offset, so that it is a couple orders of magnitude larger at the output. Program the gain to +100 (with matched and fairly low resistances at the two inputs, so that you don't measure the bias current) and amplify zero volts. The output should be 100 times the offset voltage.
.

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