Title :
A versatile digitally controlled continuous-time filter structure with wide-range and fine resolution capability
Author :
Loh, Kou-hung ; Hiser, Douglas L. ; Adams, William J. ; Geiger, Randall L.
Author_Institution :
IMP Hacienda Design Lab., Pleasanton, CA, USA
fDate :
5/1/1992 12:00:00 AM
Abstract :
A digitally programmable and reconfigurable filter structure is presented. The design is based on a versatile continuous-time biquadratic block realized by means of digitally controllable transconductance amplifiers and programmable capacitor arrays. A specific implementation, integrated in a 3 μm p-well CMOS process, which is capable of synthesizing a large number of even-ordered transfer functions of up to sixth order with complete control of all pole pairs and zero pairs, is discussed. The programmable filter exhibits typical pole and zero resonant frequency resolution of ±0.25% and typical bandwidth resolution of ±0.5% over the three-decade adjustable range from 1 kHz to 1 MHz and features typical dynamic range of 60 dB
Keywords :
CMOS integrated circuits; active filters; digital control; poles and zeros; tuning; 1 kHz to 1 MHz; 3 micron; bandwidth resolution; biquadratic block; continuous-time filter; digitally programmable; even-ordered transfer functions; fine resolution capability; p-well CMOS process; pole pairs; programmable capacitor arrays; reconfigurable filter structure; resonant frequency resolution; transconductance amplifiers; zero pairs; Bandwidth; CMOS process; Capacitors; Digital control; Digital filters; Dynamic range; Poles and zeros; Resonant frequency; Transconductance; Transfer functions;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
