P 6.3-11 The circuit shown in Figure P 6.3-11 has one input , and one output .  Show that the output is proportional to the input.  Design the circuit so that .

 

c06f050.eps

Figure P 6.3-11

Adding a couple of annotations

Voltage division tells us

 

 

Op-Amp rules require

 

Solve for

 

So

 

 is proportional to  and the gain is

 

We want it to be 5 so

 

MANY POSSIBLE ANSWERS!

 

Let’s make the assumption that

Then we get

 

 

 

One possible answer is

Other answers are possible!

 

 

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This page last updated on March 13, 2019