Science and Education Publishing American Journal of Electrical and Electronic Engineering 2 6 2014 11 23 DVCC Based K.H.N. Biquadratic Analog Filter with Digitally Controlled Variations 159 164 EN Bilal Arif Department of Electronics Engineering, Aligarh Muslim University, Aligarh, India Mohd. Usama Ismail Ale Imran AJEEE2014261 10.12691/ajeee-2-6-1 2014 05 07 2014 11 09 2014 11 23 In this paper, a digitally controlled single input multi output current-mode K.H.N. Biquad Filter is presented. The filter circuit is composed of three DVCCs together with four grounded resistors and two grounded capacitors. The digital control is incorporated using a current-summing network (CSN). Tuning of resonant frequency is carried out by 3-bit digital control word. Block by block replacement has been done to observe the change in the relationship between resonant frequency of the band-pass filter with the control word. The filter circuit showed three different variations when the DVCC blocks were replaced (one by one) with 3-bit DC-DVCC blocks. PSPICE simulations using TSMC 0.25 micron CMOS technology have been performed to validate the theoretical results.