Title :
A CMOS continuous-time active biquad filter for gigahertz-band applications
Author :
Chang, Yuyu ; Choma, John, Jr. ; Wills, Jack
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
A general high-Q biquad filter architecture capable of operating in the GHz range is proposed and analyzed. This filter, which is usable in bandpass and low-pass applications, utilizes two effective Q-enhancement techniques to circumvent the low-Q characteristics inherent in the circuit. Simulation results employing standard 0.5 μm CMOS technology have successfully verified that the center frequency tuning and hybrid Q-tuning techniques operate between 1 GHz to 2.3 GHz center frequencies with Q ranging from 4.8 to over 1000. A tunable bandpass filter with a center frequency at 1.5 GHz and a low-pass filter with a center frequency at 2.07 GHz each having Q equal to 31 have been designed to have 63 dB and 44 dB input dynamic range, and power dissipation equal to 30.5 mW and 27.8 mW, respectively
Keywords :
CMOS analogue integrated circuits; Q-factor; UHF filters; UHF integrated circuits; band-pass filters; biquadratic filters; circuit tuning; continuous time filters; linear network synthesis; low-pass filters; 0.5 micron; 1 to 2.3 GHz; 27.8 mW; 30.5 mW; CMOS active biquad filter; CMOS continuous-time filter; Q-enhancement techniques; UHF IC; active filters; bandpass applications; center frequency tuning; gigahertz-band applications; high-Q biquad filter architecture; hybrid Q-tuning technique; low-pass filter; lowpass applications; tunable band-pass filter; Active filters; Band pass filters; CMOS technology; Circuit optimization; Circuit simulation; Dynamic range; Frequency; Low pass filters; Tunable circuits and devices; Tuning;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780850
