Title :
Reducing the temperature effect on a CMOS transconductance and its application in gm-C filters
Author :
Cui, Yuelin ; Raut, R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
Abstract :
A new negative feedback technique is applied to stabilize changes in the transconductance of a CMOS operational transconductance amplifier (OTA) with temperature variations over the industrial range of -30°C to +85°C. Since OTAs are used as the basic building blocks in various gm-C filters, stabilizing the transconductance brings stability in the frequency and quality factor of the filters built from these OTAs. To validate this notion, a second order band-pass filter with 10 MHz center frequency has been built with the temperature stabilized OTAs. The whole system has been implemented in TSMC 0.18 μm CMOS technology available through the Canadian Microelectronics Corporation (CMC) and tested in the laboratory. The experimental results show close agreement with the theoretical expectations.
Keywords :
CMOS analogue integrated circuits; Q-factor; band-pass filters; circuit stability; continuous time filters; feedback amplifiers; operational amplifiers; radiofrequency filters; -30 to 85 degC; 0.18 micron; 10 MHz; CMOS transconductance temperature effects reduction; OTA; filter quality factor stability; frequency stability; gm-C filters; integrated continuous-time filters; negative feedback; operational transconductance amplifier; second order band-pass filter; transconductance stabilization; Band pass filters; CMOS technology; Frequency; Microelectronics; Negative feedback; Operational amplifiers; Q factor; Stability; Temperature distribution; Transconductance;
Conference_Titel :
Electrical and Computer Engineering, 2004. Canadian Conference on
Print_ISBN :
0-7803-8253-6
DOI :
10.1109/CCECE.2004.1345037
