Question

Determine the output voltage for an op-amp with single break frequency.

(a) VO ={ jXC /[Ro+(iXC)]} × AVid

(b) VO = = AVid / [1+ j2πfRoC].

(c) VO = AVid /(Ro+j2πfC)

(d) VO = Vid / [Ro-(j2πfRoC)].

This question was addressed to me in unit test.

I need to ask this question from Open-Loop Voltage Gain as a Function of Frequency topic in portion Practical Limitations of Op Amp Circuits of Linear Integrated Circuits

Answer 1

The correct choice is (b) VO = = AVid / [1+ j2πfRoC].

Navigate through clarity with: The output voltage for an op-amp with single break frequency,

VO = {(-jXC) / [(Ro)-(jXC)} ×AVid

∵ -j=1/j & XC =1/2πfC

=> VO = {(1/j2ΠfC)/[Ro + (1/ j2πfC)] }  × AVid  = AVid  / [1+ j2πfRoC].