Title :
A widely tunable Gm-C filter using tail current offset in two differential pairs
Author :
Tanaka, Tomoyuki ; Cha, Sungwoo ; Shimizu, Shinsaku ; Ida, Tsukasa ; Ishihara, Hiroaki ; Matsuoka, Toshimasa ; Taniguchi, Kenji ; Sugimori, Akashi ; Hihara, Hiroki
Author_Institution :
SYNTHESIS Corp., Osaka, Japan
Abstract :
A wide tuning range operational transconductance amplifier (OTA) using tail current offset in two differential pairs is proposed. SPICE simulations of the designed fifth-order Butterworth low-pass filter (LPF) using OTA in a mixed-signal 0.25 μm CMOS process with a single 3.3 V power supply shows the cut-off frequency range from 1.5 to 50 MHz, which is wider than that of conventional filter. Total harmonic distortion (THD) for differential input voltage of 0.1 Vpp at 1 MHz is less than -57 dB.
Keywords :
Butterworth filters; CMOS integrated circuits; SPICE; circuit simulation; circuit tuning; electric current; harmonic distortion; integrated circuit design; low-pass filters; mixed analogue-digital integrated circuits; operational amplifiers; 0.1 V; 0.25 micron; 1 MHz; 1.5 to 50 MHz; 3.3 V; OTA; SPICE simulation; THD; cut-off frequency range; differential input voltage; differential pairs; fifth-order Butterworth low-pass Filter; mixed-signal CMOS process; operational transconductance amplifier; single power supply; tail current offset; total harmonic distortion; widely tunable Gm-C filter; CMOS process; Differential amplifiers; Low pass filters; Operational amplifiers; Power harmonic filters; Power supplies; SPICE; Tail; Transconductance; Tuning;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464712
