Universal biquadratic filters employing operational transresistance amplifiers are presented. All 5 different second-order filtering functions, namely low-pass, high-pass, band-pass, notch, and all-pass, can be realized. The quality factor of the filters can be adjusted electronically without affecting resonant frequency. The configuration can be made fully integrated based on MOS-C realization, by making use of the current differencing and internally grounded inputs of OTRA. PSpice simulation results are given to verify the theoretical analysis.
GÖKÇEN, AHMET; KILINÇ, SELÇUK; and ÇAM, UĞUR
"Fully integrated universal biquads using operational transresistance amplifiers with MOS-C realization,"
Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 19:
3, Article 4.
Available at: https://journals.tubitak.gov.tr/elektrik/vol19/iss3/4