Question

1. What is the difference between an opamp practical differentiator and an ideal differentiator?
2. How does one attenuate the output amplitude from the function generator?
3. What is the meaning of the -20dB selection on the function generator?

Answer 1

1).The circuit diagram of ideal differentiator is given below

K; Ideal Ai\

Output voltage of ideal differentiator is given by following equation

We can see that output voltage increases as the frequency of input signal increases. At very high frequency, the ideal differentiator may become unstable and noisy.

Vo--RC-Vi dt

This drawback is removed by practical differentiator. The circuit diagram of practical differentiator shown below.

2). The output amiltude of function generatornis attenuated by selecting or pressing the dB button of function generator.

3).Converting -20 dbB into linear scale

Vo/Vi = 10-20/20-1/10

It means amplude is reduced by a factor of 1/10.

Please upvote if you find this answer helpful to you