Title :
New Universal Biquads Employing CFOAs
Author :
Singh, V.K. ; Singh, A.K. ; Bhaskar, D.R. ; Senani, Raj
Author_Institution :
Dept. of Electron. & Commun. Eng., Inst. of Eng. & Technol., Lucknow
Abstract :
Four new single-input-multi-output-type universal biquad filters using current-feedback operational amplifiers (CFOAs) are presented, which realize all the five standard filter functions (namely, low-pass, bandpass, high-pass, notch, and all-pass) from the same configuration, provide tunability of the various filter parameters in all the five responses, and offer a resistive or ideally infinite input impedance while employing only four CFOAs and two grounded capacitors as preferred for integrated circuit implementation. The workability of the new biquads has been verified by hardware implementations and SPICE simulations based upon AD844-type CFOAs, and some sample results are presented
Keywords :
all-pass filters; band-pass filters; biquadratic filters; circuit tuning; high-pass filters; low-pass filters; notch filters; operational amplifiers; CFOA; SPICE simulations; all-pass filter; analog circuit design; bandpass filter; current-feedback operational amplifiers; filter tunability; high-pass filter; low-pass filter; notch filter; universal biquad filters; Active filters; Band pass filters; Capacitors; Circuit synthesis; Hardware; Impedance; Low pass filters; Operational amplifiers; SPICE; Workability; Analog circuit design; biquad filters; current-feedback operational amplifiers (CFOAs);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.882345
