Title :
A Reconfigurable Continuous-Time Delta-Sigma Modulator for Dual-Mode Ultrasonic Application
Author :
Pengyu Song ; Kei-Tee Tiew ; Lam, Y. ; Liang Mong Koh
Author_Institution :
Nanyang Technol. Univ., Singapore
Abstract :
The paper presents a reconfigurable continuous-time (CT) delta-sigma modulator (DSM) for dual-mode ultrasonic application. The modulator supports two operating modes: B-mode and continuous-wave (CW) Doppler mode. A low-pass DSM was designed for the B-mode operation and it can achieve a dynamic range of 62.5 dB with a signal bandwidth of 5 MHz. A band-pass DSM for the CW Doppler mode was implemented based on the low-pass modulator design. The simulated dynamic range of the band-pass DSM is 115.0 dB with a signal bandwidth of 200 kHz. By sharing most of the building blocks between the low-pass and the band-pass modulators, the overall hardware complexity as well as the power consumption can be reduced.
Keywords :
delta-sigma modulation; ultrasonic applications; ultrasonic devices; B-mode operation; band-pass modulators; bandwidth 200 kHz; bandwidth 5 MHz; continuous-time delta-sigma modulator; continuous-wave Doppler mode; dual-mode ultrasonic application; hardware complexity; low-pass modulator; power consumption; Acoustic applications; Array signal processing; Bandwidth; Delta modulation; Dynamic range; Energy consumption; Filters; Hardware; Signal resolution; Ultrasonic imaging;
Conference_Titel :
Integrated Circuits, 2007. ISIC '07. International Symposium on
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-0797-2
Electronic_ISBN :
978-1-4244-0797-2
DOI :
10.1109/ISICIR.2007.4441859
