A micropower OTA for digitally calibrated algorithmic ADCs

Author

Wichman, Christopher ; Ravindran, Arun

Author_Institution

Dept. of Electr. & Comput. Eng., North Carolina Univ., Charlotte, NC

fYear

2005

fDate

7-10 Aug. 2005

Firstpage

279

Abstract

The paper presents techniques to realize micropower OTAs using the inversion coefficient design methodology. Such OTAs find use in low speed moderate resolution algorithmic ADCs where use of digital calibration relaxes the analog performance requirements while simultaneously demanding low voltage operation to reduce the power dissipation of the added digital circuitry. A prototype switched OTA sample and hold and gain-by-two stages was fabricated in 0.5-mum CMOS. Measured results indicate that the fabricated prototype gain-by-two amplifier dissipates 30 muW at 1.5 V and shows a gain of 1.84 V/V when switched at 100 KHz

Keywords

CMOS integrated circuits; analogue-digital conversion; calibration; integrated circuit design; low-power electronics; operational amplifiers; 0.5 micron; 1.5 V; 100 kHz; 30 muW; CMOS process; analog-digital converters; digital calibration; inversion coefficient; micropower OTA; micropower operational transconductance amplifier; Biomedical signal processing; Calibration; Circuits; Design methodology; Low voltage; Power dissipation; Prototypes; Signal processing algorithms; Signal resolution; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. 48th Midwest Symposium on

Conference_Location

Covington, KY

Print_ISBN

0-7803-9197-7

Type

conf

DOI

10.1109/MWSCAS.2005.1594093

Filename

1594093