Keywords:
Frequency Response
Active Filter
Problem #5
Find the cutoff frequency of the filter. Use voltage divider to derive the transfer function. Obtain the output voltage in s.s.s when the input voltage is Vin=1cos(100t) V and Vin=1cos(10,000t+90°) V.
Need a hint?
Write a KCL equation at the inverting input node of the op amp to derive the transfer function. The circuit is a first order highpass filter. The Output voltage in s.s.s. can be found by evaluating the transfer at the input frequency. And then multiply the amplitude of the input by that of H(s) to get the amplitude of the output. Add the phase angle of the input to that of H(s) to get the phase angle of the output.