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

fYear

2006

fDate

21-24 May 2006

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISCAS.2006.1692669

Filename

1692669