Estimaing the gain from a grapf for a invertng amplifier

[Englewood]

Estimating the gain from a graph for a invertng amplifier



How do I estimate the gain from this graph.

Its a graph of a inverting amplifier!

 

[chuckey]

-2.4 times
Frank

 

[Englewood]

-2.4 times
Frank

How did you work that out?

Is it max out / max in?

 

[D.A.(Tony)Stewart]

Re: Estimating the gain from a graph for a invertng amplifier

From basic Calculus, the partial derivative is the slope , measured from any graph by Δy/Δx.

For ease of mental calculations, use an Δx integer or the intercepts on the X axis to view the Δy difference.

One can also average the slope from multiple points to improve accuracy of reading graph.

If random estimate/measurement errors , the result is improved by root of number of samples is from statistics or drawing a straight line and extend the line to both axes.

This method is also used to measure active component effective series resistance (ESR) when saturated from V-I curve.

 

[Audioguru]

I simply noticed that with 1V in the output is about 2.2V. For 2V in the output is about 4.4V. For 3V in the output is about 6.6V.
Then simple arithmetic calculates the gain to be about 2.2 times.