Figure 4 (a). Simulated Lowpass and Highpass responses

From

DVCC Based K.H.N. Biquadratic Analog Filter with Digitally Controlled Variations

Bilal Arif, Mohd. Usama Ismail, Ale Imran

American Journal of Electrical and Electronic Engineering. 2014, 2(6), 159-164 doi:10.12691/ajeee-2-6-1