Title :
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
fDate :
1/1/2001 12:00:00 AM
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 Vpp 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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
