A 1-V CMOS switched-opamp switched-capacitor pseudo-2-path filter

Author

Cheung, Vincent Sin-Luen ; Luong, Howard Cam ; Ki, Wing-Hung

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China

Volume

36

Issue

1

fYear

2001

fDate

1/1/2001 12:00:00 AM

Firstpage

14

Lastpage

22

Abstract

A modified switched-opamp technique is proposed to enable switched-capacitor (SC) circuits to operate at 1 V with the opamp fully functional in all phases. A 1-V fully differential two-switchable-output-pair operational amplifier has been designed for the proposed technique, which is then employed in a 1-V fully differential SC pseudo-2-path filter. Implemented in a standard single-poly triple-metal 0.5-μm CMOS process, the filter achieves a sixth-order bandpass response centered at 75 kHz with a quality factor of 45. Capacitors formed with polysilicon and highly doped n-well (cap-well option) regions are used to achieve both good linearity and small chip area. At 1-V supply, the filter obtains an output swing of 1.2 V_pp and a dynamic range of 51 db while dissipating 310 μW and occupying a chip area of 0.8 mm²

Keywords

CMOS analogue integrated circuits; Q-factor; band-pass filters; low-power electronics; switched capacitor filters; 0.5 micron; 1 V; 310 muW; 75 kHz; CMOS; chip area; dynamic range; fully differential two-switchable-output-pair operational amplifier; highly doped n-well; linearity; output swing; pseudo-2-path filter; quality factor; sixth-order bandpass response; switched-opamp switched-capacitor filter; Band pass filters; CMOS process; CMOS technology; Clocks; Differential amplifiers; Dynamic voltage scaling; Low voltage; Operational amplifiers; Power semiconductor switches; Switching circuits;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.896224

Filename

896224