Title :
Low-voltage CMOS GM-C filter with rail-to-rail common-mode voltage
Author :
Hung, Chung-Chih ; Halonen, Kari ; Porra, Veikko ; Ismail, Mohammed
Author_Institution :
Dept. of Electr. Eng., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
In this paper, a CMOS design of low-voltage 5th-order elliptic low-pass GM-C filter with rail-to-rail common-mode input voltage is introduced. The Operational Transconductance Amplifier (OTA) inside this filter is a low-voltage rail-to-rail voltage-to-current converter (V-I converter). In this V-I converter, an N-type V-I converter cell is connected in parallel with its counterpart, a P-type V-I converter cell, to achieve common-mode rail-to-rail operation. Maximum-current selecting circuits are utilized to generate constant-gm output currents for this OTA. This 5th-order elliptic low-pass GM-C filter operates at a supply voltage of 3 V and has a cutoff frequency of 500 kHz
Keywords :
CMOS analogue integrated circuits; active filters; elliptic filters; low-pass filters; operational amplifiers; 3 V; 500 kHz; 5th-order filter; CMOS design; LV CMOS GM-C filter; OTA; V-I converter; elliptic low-pass filter; low voltage operation; operational transconductance amplifier; rail-to-rail common-mode voltage; voltage-to-current converter; CMOS technology; Circuits; Cutoff frequency; Laboratories; Low pass filters; MOSFETs; Operational amplifiers; Rail to rail operation; Threshold voltage; Very large scale integration;
Conference_Titel :
Circuits and Systems, 1996., IEEE 39th Midwest symposium on
Conference_Location :
Ames, IA
Print_ISBN :
0-7803-3636-4
DOI :
10.1109/MWSCAS.1996.588086
