Title :
A 3 V all-MOS elliptical 1 MHz Gm-C-OTA filter
Author :
Lindfors, Saska ; Halonen, Kari ; Ismail, Mohammed
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
The Gm-C-OTA-technique relaxes transconductor output swing and DC-gain requirements, which makes it a suitable candidate for low-voltage circuits. To reduce the power consumption of OTAs an excess-phase compensation with automatic tuning circuit is proposed. A floating triode region transconductor with a novel biasing to compensate the effect of channel length modulation is presented. The two independent common-mode levels in a Gm-C-OTA-integrator are utilized to bias a PMOS as a linear floating capacitor. An implementation and simulation results for a 3 V all-MOS elliptical filter are presented
Keywords :
CMOS analogue integrated circuits; circuit tuning; compensation; continuous time filters; elliptic filters; integrating circuits; low-pass filters; operational amplifiers; 1 MHz; 3 V; CMOS elliptical filter; Gm-C-OTA filter; Gm-C-OTA-integrator; PMOS linear floating capacitor; active filters; automatic tuning circuit; biasing; channel length modulation compensation; excess-phase compensation; floating triode region transconductor; low-voltage circuits; power consumption reduction; transconductor output swing; Broadband amplifiers; Circuits; Filters; Frequency; Laboratories; MOS capacitors; Parasitic capacitance; Transconductance; Transconductors; Voltage;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.621541
