Title :
CMOS variable-gain wide-bandwidth CMFB-free differential current feedback amplifier for ultrasound diagnostic applications
Author :
Chao, Hio Leong ; Ma, Dongsheng
Author_Institution :
Dept. of Electr. & Comput. Eng., Arizona Tucson Univ., AZ
Abstract :
A CMOS current feedback amplifier (CFA) for ultrasound diagnostic applications is described in this paper. Unlike traditional CFA designs, this design proposes a new symmetrical circuit architecture which does not require extra common-mode feedback circuitry. The design employs active feedback to enhance the gain-bandwidth independence. Miller compensation is adopted for better frequency response and smaller on-chip capacitor. The CFA has been designed with TSMC 0.35 mum CMOS process. The active layout area is 0.052 mm2. HSPICE post-layout simulation shows that the CFA exhibits a bandwidth of 10.7 MHz for a variable voltage gain range of 6 dB to 60 dB, with a supply of 3.3 V and a power dissipation of 2.4 mW. Compared to CFA design without active feedback, the bandwidth variation is reduced by 8 times
Keywords :
CMOS integrated circuits; biomedical electronics; biomedical ultrasonics; differential amplifiers; feedback amplifiers; integrated circuit design; 0.35 micron; 10.7 MHz; 2.4 mW; 3.3 V; 6 to 60 dB; CMOS current feedback amplifier; HSPICE; Miller compensation; common-mode feedback circuit; frequency response; on-chip capacitor; symmetrical circuit architecture; ultrasound diagnostics; Bandwidth; CMOS process; Capacitors; Circuit simulation; Feedback amplifiers; Feedback circuits; Frequency response; Gain; Ultrasonic imaging; Voltage;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692669
