Title :
A band pass /spl Sigma//spl Delta/ modulator for ultrasound imaging at 160 MHz clock rate
Author_Institution :
Comlinear Corp., Fort Collins, CO, USA
Abstract :
Phased-array ultrasound imaging is a promising application for /spl Sigma//spl Delta/ converters, where overall analog hardware can be simplified in exchange for increased digital signal processing (DSP) complexity. A 4th-order band-pass modulator for this application in 0.8 /spl mu/m BiCMOS has a 2.5 MHz-wide signal band centered at 5 MHz. To meet system-level specifications, the modulators dynamic range is 84 dB, achieved by sampling at 160 MHz and performing 24 dB of time-gain-control in the modulator. Noise shaping is programmable between band-reject and notch functions for B-mode (wide band) and CW-mode (narrow band) scanning, respectively.
Keywords :
BiCMOS integrated circuits; sigma-delta modulation; ultrasonic imaging; 0.8 micron; 160 MHz; 2.5 MHz; 5 MHz; B-mode scanning; BiCMOS chip; CW-mode scanning; analog hardware; band pass /spl Sigma//spl Delta/ modulator; band-reject function; digital signal processing; dynamic range; noise shaping; notch function; phased-array ultrasound imaging; time-gain-control; Analog-digital conversion; BiCMOS integrated circuits; Digital signal processing; Dynamic range; Hardware; Narrowband; Noise shaping; Signal sampling; Ultrasonic imaging; Wideband;
Conference_Titel :
Solid-State Circuits Conference, 1996. Digest of Technical Papers. 42nd ISSCC., 1996 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3136-2
DOI :
10.1109/ISSCC.1996.488586
