If full scale voltage is to be V out = -2 V, then value of R F wo

If full scale voltage is to be V out = -2 V, then value of R F wo
| If full scale voltage is to be Vout = -2 V, then value of RF would be

A. 4.27 kΩ

B. 4 k Ω

C. 3.16 kΩ

D. 3 kΩ

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

The full scale output voltage is given by

Here, R and Vref are constant, and Rf changes for both case, i.e.

V0directly proportional to Rf

Or ………………(i)

We have,

V01 = - 4.6875 V for Rf1 = 10 k Ω

V02 = - 2 V for Rf2 = ?

Hence, substituting the values in question (1), we obtain

Or,

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