Title :
Design of a new linear OTA with a mobility compensation technique [Bessel filter application]
Author :
Yang, Sung-Hyun ; Kim, Kyu-Ho ; Cheong, Cha-Keon ; Cho, Kyoung-Rok
Author_Institution :
Dept. of Comput. & Commun. Eng., Chung-Buk Nat. Univ., Cheongju, South Korea
Abstract :
This paper describes an implementation of the 9th-order Bessel filter using a new linear operational transconductance amplifier (OTA). To improve the linearity of the OTA, we employ a mobility compensation circuit. The combination of the triode and the subthreshold region transistors can provide the OTA with good linearity. The proposed OTA has ±0.5% Gm variation over the input range of ±0.8-V. The total harmonic distortion (THD) was below -67-dB. The 9th-order Bessel filter has been simulated in a 0.35-μm n-well CMOS process under 3.3-V supply voltage. It shows the cutoff frequency of 8-MHz and the power consumption of 135-mW.
Keywords :
CMOS analogue integrated circuits; active filters; carrier mobility; compensation; harmonic distortion; operational amplifiers; -0.8 to 0.8 V; 0.35 micron; 135 mW; 3.3 V; 8 MHz; THD; linear OTA; linear operational transconductance amplifier; mobility compensation technique; n-well CMOS process; ninth-order Bessel filter; subthreshold region transistors; total harmonic distortion; triode region transistors; CMOS process; Circuit simulation; Cutoff frequency; Linearity; Nonlinear filters; Operational amplifiers; Power harmonic filters; Total harmonic distortion; Transconductance; Voltage;
Conference_Titel :
Mixed-Signal Design, 2003. Southwest Symposium on
Print_ISBN :
0-7803-7778-8
DOI :
10.1109/SSMSD.2003.1190405
