A Feed-Forward Automatic-Gain Control Amlifier for Biomeducal Appications

Author

Hsu, Yu-Pin ; Lin, Yu-Tso ; Chen, Chun-Hao ; Lu, Shey-Shi

Author_Institution

Grad. Inst. of Electron. Eng., Nat. Taiwan Univ., Tainan

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

A novel CMOS feed-forward automatic-gain control (FFAGC) amplifier is presented. The proposed amplifier is intended to amplify various kinds of biomedical signals with a wide dynamic range characteristic. The feed-forward automatic-gain control (FFAGC) technique is adopted to provide appropriate gain settings. Furthermore, a class-AB output stage realizes large driving ability for an external ADC. The experimental results showed that variable gains of 0 dB, 6 dB, 14 dB, and 20 dB with a bandwidth of 55 kHz, input referred noise of 200 nV/radicHZ at 500 Hz, rail-to-rail input common-mode range, and rail-to-rail output dynamic range can be achieved while the output loading capacitor is 330 nF. The power consumption is 819 muW with 3 V of supply voltage.

Keywords

CMOS integrated circuits; automatic gain control; biomedical electronics; capacitors; feedforward amplifiers; CMOS; biomedical signals; feedforward automatic-gain control amplifier; frequency 500 Hz; output loading capacitor; power consumption; rail-to-rail input common-mode range; rail-to-rail output dynamic range; Automatic control; Bandwidth; Capacitors; Dynamic range; Energy consumption; Feedforward systems; Gain; Rail to rail inputs; Rail to rail outputs; Voltage; AGC; FFAGC; IA; PGA; amplifier; bop-sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. APMC 2007. Asia-Pacific

Conference_Location

Bangkok

Print_ISBN

978-1-4244-0748-4

Electronic_ISBN

978-1-4244-0749-1

Type

conf

DOI

10.1109/APMC.2007.4554678

Filename

4554678