PHYS345 Electricity and Electronics

Quiz 10: Op Amp Circuits

You are working with a sinusoidal signal at 300 Hz that has a troubling noise component at 60 Hz. The unfiltered signal-to-noise ratio is 14dB.

You decide to build a simple differentiator circuit to boost the signal at the expense of the lower-frequency noise. On hand are capacitors of value 1.0 microFarad and 0.01 microFarad and numerous resistors in the range 1.0 k to 1.0 M. Design a differentiator with a gain of 100 at 300 Hz.

What is the signal-to-noise ratio at the output of the differentiator?

Last updated Dec. 3, 1998.
Copyright George Watson, Univ. of Delaware, 1998.