Title :
A 1.8V CMOS fourth-order Gm-C bandpass sigma-delta modulator dedicated to front-end ultrasonic receivers
Author :
Qin, Lisheng ; El-Sankary, Kamal ; Sawan, Mohamad
Author_Institution :
Dept. of Electr. Eng., Ecole Polytechnique de Montreal, Que., Canada
Abstract :
A 4th-order bandpass ΣΔ modulator for ultrasound applications is presented. By cascading 2 identical 2nd-order Gm-C filters, the 4th-order modulator is designed with high power efficiency, stability and programmability. The modulator dynamic range is 78dB over a 200kHz bandwidth around IF frequency of 3 MHz. The modulator has been implemented in a standard 0.18 μm CMOS technology and consumes 2.5 mW from 1.8V power supply.
Keywords :
CMOS integrated circuits; band-pass filters; receivers; sigma-delta modulation; ultrasonic applications; 0.18 micron; 1.8 V; 2.5 mW; 200 kHz; 3 MHz; 4th-order modulator; CMOS technology; bandpass sigma-delta modulator; fourth-order sigma-delta modulator; front-end ultrasonic receiver; ultrasound application; Band pass filters; Bandwidth; CMOS technology; Delta-sigma modulation; Dynamic range; Frequency; Modulation coding; Power supplies; Stability; Ultrasonic imaging;
Conference_Titel :
Solid-State and Integrated Circuits Technology, 2004. Proceedings. 7th International Conference on
Print_ISBN :
0-7803-8511-X
DOI :
10.1109/ICSICT.2004.1436855
