Title :
Active compensation of operational transconductance amplifier filters using partial positive feedback
Author :
Ramírez-Angulo, Jaime ; Sanchez-Sinencio, Edgar
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
An active compensation technique to improve high-frequency performance of operational transconductance capacitor (OTA-C) filters is presented. The technique consists of minimizing the operational transconductance amplifier´s (OTA´s) excess phase. Each critical OTA is replaced by two OTAs connected in parallel with opposite polarity and different transconductances. The novel feature of this technique is that it does not require tuning to reduce excess phase. This technique yields filters with extended tuning range. The technique is demonstrated by a 6-MHz bandpass filter fabricated in double-metal 3-μm CMOS technology
Keywords :
CMOS integrated circuits; active filters; band-pass filters; compensation; feedback; linear integrated circuits; operational amplifiers; 3 micron; 6 MHz; CMOS technology; OTA; active compensation; bandpass filter; double-metal; excess phase reduction; extended tuning range; high-frequency performance; operational transconductance amplifier; partial positive feedback; Active filters; Band pass filters; CMOS technology; Circuit optimization; Filtering theory; Frequency; Operational amplifiers; Parasitic capacitance; Transconductance; Tuning;
Conference_Titel :
Circuits and Systems, 1989., Proceedings of the 32nd Midwest Symposium on
Conference_Location :
Champaign, IL
DOI :
10.1109/MWSCAS.1989.102072
