Title :
Low-voltage low-power CMOS rail-to-rail V-I converters
Author :
Azcona, C. ; Calvo, B. ; Celma, S. ; Medrano, N.
Author_Institution :
Group of Electron. Design, Univ. of Zaragoza, Zaragoza, Spain
Abstract :
This paper presents three compact and simple CMOS voltage-to-current (V-I) converter schemes attaining rail-to-rail operation with a highly linear V-I relationship over a (-40, +140 °C) temperature range. Based on an OTA/common source amplifier configuration, the key idea to reach rail-to-rail operation is reducing the voltage across the linear resistor that performs the V-I conversion to keep the output current mirroring transistor working in the saturation region over the complete input range. Results for 1.2 V - 0.18 μm CMOS implementations show that all the proposed converters operate over the entirely input range with GM errors below 2.5%, linearity errors below 0.011% and power consumptions below 70 μW, which makes them suitable for portable applications.
Keywords :
CMOS integrated circuits; convertors; low-power electronics; operational amplifiers; CMOS voltage-to-current converter scheme; OTA; common source amplifier configuration; linear resistor; low-voltage low-power CMOS; rail-to-rail V-I converter; size 0.18 micron; voltage 1.2 V; Attenuation; CMOS integrated circuits; Linearity; Power demand; Resistors; Temperature; Transistors; V-I converter; low-voltage low-power; rail-to-rail; temperature compensation;
Conference_Titel :
Circuit Theory and Design (ECCTD), 2011 20th European Conference on
Conference_Location :
Linkoping
Print_ISBN :
978-1-4577-0617-2
Electronic_ISBN :
978-1-4577-0616-5
DOI :
10.1109/ECCTD.2011.6043312