A 2.4 Hz-to-10 kHz-tunable biopotential filter using a novel capacitor multiplier

Author

Chen, Chang-Hao ; Mak, Pui-In ; Zhang, Tan-Tan ; Vai, Mang-I ; Mak, Peng-Un ; Pun, Sio-Hang ; Wan, Feng ; Martins, R.P.

Author_Institution

Biomed. Eng. Lab., Univ. of Macau, Macao, China

fYear

2009

fDate

19-21 Jan. 2009

Firstpage

372

Lastpage

375

Abstract

This paper describes a high-dynamic-range 2.4 Hz-to-10 kHz wide-range tunable 5^th-order Butterworth lowpass filter for biomedical applications. A differential g_m-C topology in conjunction with a subthreshold-biased wide-g_m-range OTA realizes efficiently a wide frequency tuning capability. For capacitance savings with consequent silicon area reduction, a merged use of floating real capacitor and grounded multiplier-based capacitor is proposed. Optimized in a 0.35-Â¿m CMOS process, the filter achieves over 68-dB dynamic range, 64 dB stopband attenuation and 28 Â¿W power consumption at a single 3-V supply.

Keywords

Butterworth filters; CMOS integrated circuits; bioelectric potentials; biomedical electronics; capacitors; low-pass filters; medical signal processing; CMOS process; capacitance savings; capacitor multiplier; differential gm-C topology; dynamic range; floating real capacitor; frequency 2.4 Hz to 10 kHz; frequency tuning capability; grounded multiplier-based capacitor; power 28 muW; power consumption; silicon area reduction; stopband attenuation; tunable 5th-order Butterworth lowpass filter; tunable biopotential filter; voltage 3 V; Attenuation; CMOS process; Capacitance; Capacitors; Dynamic range; Filters; Frequency; Silicon; Topology; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics & Electronics, 2009. PrimeAsia 2009. Asia Pacific Conference on Postgraduate Research in

Conference_Location

Shanghai

Print_ISBN

978-1-4244-4668-1

Electronic_ISBN

978-1-4244-4669-8

Type

conf

DOI

10.1109/PRIMEASIA.2009.5397367

Filename

5397367