Low-voltage low-power high dB-Linear CMOS exponential function generator using highly-linear V-I converter

Author

Duong, Quoc-Hoang ; Nguyen, Trung-Kien ; Lee, Sang-Gug

Author_Institution

Inf. & Commun. Univ., Daejeon, South Korea

fYear

2003

fDate

25-27 Aug. 2003

Firstpage

349

Lastpage

352

Abstract

A CMOS voltage-to-current converter with exponential characteristic is presented in this paper. The concept of Taylor series expansion is used for realizing the exponential characteristic. The proposed exponential V-I converter is composed of a current-to-current squarer and a linear V-I converter with the use of linearization technique. Based on a 0.25 μm CMOS process, simulations show a 23 dB of linear-output current range and the linearity within 20 dB with error less than ±0.5dB is achieved. The total power consumption is below 0.2 mW with 1.25 V supply voltage. The proposed circuit can be used for the design of an extremely low-voltage low-power variable gain amplifier (VGA).

Keywords

CMOS analogue integrated circuits; circuit simulation; convertors; differential amplifiers; function generators; integrated circuit design; low-power electronics; 0.2 mW; 1.25 V; CMOS exponential function generator; CMOS voltage-current converter; Taylor series expansion; current-to-current squarer; differential amplifier; highly-linear V-I converter; linear-logarithmic function; linearization technique; low-voltage low-power generator; simulations; variable gain amplifier; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS process; CMOS technology; Digital signal processing; Energy consumption; Linearization techniques; Low voltage; Signal design; Signal generators;

fLanguage

English

Publisher

ieee

Conference_Titel

Low Power Electronics and Design, 2003. ISLPED '03. Proceedings of the 2003 International Symposium on

Print_ISBN

1-58113-682-X

Type

conf

DOI

10.1109/LPE.2003.1231912

Filename

1231912