Title :
MOSFET-C filter with on-chip tuning and wide programming range
Author :
Osa, Juan Ignacio ; Carlosena, Alfonso ; López-Martín, Antonio J.
Author_Institution :
Dept. of Electr. & Electron. Eng., Public Univ. of Navarra, Pamplona, Spain
fDate :
10/1/2001 12:00:00 AM
Abstract :
This paper describes a complete system that includes a signal processing circuit, i.e., a bandpass audio filter, with its surrounding Q and fc tuning circuitry. The filter is not only tunable against fabrication tolerances or aging, but also programmable by the user in a wide range for both parameters. To achieve this goal, a novel phase-locked loop architecture has been designed and implemented. For the amplitude detection and control of both voltage-controlled oscillator and Q-tuning circuit, a novel scheme is also proposed. The complete system has been implemented on a 0.5-μm CMOS technology
Keywords :
CMOS analogue integrated circuits; Q-factor; adaptive filters; band-pass filters; circuit tuning; continuous time filters; frequency response; phase locked loops; programmable filters; CMOS technology; MOSFET-C filter; adaptive loop filter; amplitude control; amplitude detection; bandpass audio filter; continuous-time filters; fabrication tolerances; master-slave scheme; on-chip tuning; phase-locked loop architecture; programmable filters; selective filter; signal processing circuit; tunable Q factor; tuning circuitry; wide programming range; Aging; Band pass filters; CMOS technology; Circuit optimization; Fabrication; MOSFET circuits; Phase locked loops; Signal processing; Tunable circuits and devices; Tuning;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
