Title :
CMOS Low-Power Variable-Gain CMFB-Free Current Feedback Amplifier for Ultrasound Diagnostic Applications
Author :
Chao, Hio Leong ; Ma, Dongsheng ; Koen, Mike ; Prazak, Paul
Author_Institution :
Univ. of Arizona, Tucson
Abstract :
A CMOS current feedback amplifier (CFA) for ultrasound diagnostic applications is proposed. Unlike traditional CFAs, this design employs a new symmetrical and compact architecture, without the use of common-mode feedback (CMFB) circuitry. The design proposes an active feedback technique to drastically enhance the gain-bandwidth independence. It is also the first CFA to adopt Miller compensation for better frequency response with smaller compensation capacitor. The proposed CFA was fabricated and tested with a standard 0.35 mum CMOS process with competitive performance to its Bipolar and BiCMOS counterparts. The active die area is 0.052 mm2. Experiment results show that the CFA exhibits a minimum bandwidth of 4.5 MHz with a variable gain range of 0 to 46 dB, and a power dissipation of 2.18 mW.
Keywords :
CMOS analogue integrated circuits; biomedical ultrasonics; feedback amplifiers; frequency response; low-power electronics; ultrasonic applications; CMFB circuit; CMFB-free current feedback amplifier; CMOS current feedback amplifier; Miller compensation; active feedback technique; bandwidth 4.5 MHz; common-mode feedback circuit; compensation capacitor; frequency response; gain 0 dB to 46 dB; low-power variable-gain amplifier; power 2.18 mW; size 0.35 mum; ultrasound diagnostic applications; Bandwidth; BiCMOS integrated circuits; CMOS process; Capacitors; Circuit testing; Feedback amplifiers; Feedback circuits; Frequency response; Gain; Ultrasonic imaging;
Conference_Titel :
Solid-State Circuits Conference, 2006. ASSCC 2006. IEEE Asian
Conference_Location :
Hangzhou
Print_ISBN :
0-7803-9734-7
Electronic_ISBN :
0-7803-97375-5
DOI :
10.1109/ASSCC.2006.357942
