Title :
A monolithic RF image-reject filter
Author :
Chang, Yuyu ; Choma, John, Jr.
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
A CMOS inductorless image-reject filter based on active RLC circuitry is discussed and designed with the emphasis on low-noise, low-power, and gigahertz-range circuits. Two Q-enhancement techniques are utilized to circumvent the low Q characteristics inherent in the simple feedback circuit. The frequency tuning is almost independent of Q tuning, facilitating the design of the automatic tuning circuitry. The stability of the filter is also discussed. Simulations using 0.6 μm CMOS technology demonstrate the feasibility of the tunable image-reject filter for GSM wireless applications. Simulation results show 4.75 dB voltage gain, 7.2 dB noise figure, and -20 dBm IIP3 at a passband centered at 947 MHz. The image signal suppression is 60 dB at 1089 MHz and the power consumption is 27 mW
Keywords :
CMOS analogue integrated circuits; Q-factor; UHF filters; UHF integrated circuits; active filters; band-stop filters; cellular radio; circuit feedback; circuit stability; circuit tuning; integrated circuit design; integrated circuit noise; low-power electronics; 0.6 micron; 27 mW; 4.75 dB; 7.2 dB; 947 to 1089 MHz; CMOS technology; GSM wireless applications; Q-enhancement techniques; RF image-reject filter; active RLC circuitry; automatic tuning circuitry; feedback circuit; filter stability; frequency tuning; gigahertz-range circuits; inductorless filter; low-noise operation; low-power operation; monolithic image-reject filter; tunable image-reject filter; Active filters; CMOS technology; Circuit optimization; Circuit simulation; Circuit stability; Feedback circuits; GSM; RLC circuits; Radio frequency; Tunable circuits and devices;
Conference_Titel :
Mixed-Signal Design, 2000. SSMSD. 2000 Southwest Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-5975-5
DOI :
10.1109/SSMSD.2000.836443
