Title :
A monolithic CMOS 2368±30 MHz transformer based Q-enhanced series-C coupled resonator bandpass filter
Author :
Kulyk, Jim ; Haslett, James
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada
Abstract :
A three-pole 0.1 dB ripple Chebyshev series-C coupled resonator bandpass filter with transformer-based Q-enhancement is presented. This Q-enhancement technique compensates resonator loss and produces a flat passband response with low insertion loss. The compensation scheme uses frequency-dependent negative resistance to compensate frequency-dependent inductor losses, avoiding passband distortion, which is a problem with cross-coupled negative resistance circuits. Fabricated in 0.18 μm CMOS, the measured filter center frequency is 2368 MHz with a 60 MHz (3 dB) bandwidth, including probe pad and connecting trace parasitic losses. The filter draws 5.84 mA at 1.5 V, and the die area is 1.5 mm×1.5 mm.
Keywords :
CMOS integrated circuits; Chebyshev filters; Q-factor; UHF filters; VHF filters; band-pass filters; compensation; negative resistance; resonator filters; transformers; 0.1 dB; 0.18 micron; 1.5 V; 1.5 mm; 2368 MHz; 3 dB; 5.84 mA; 60 MHz; CMOS integrated circuit; Chebyshev filter; Q-enhancement technique; bandpass filter; coupled resonator filter; cross-coupled negative resistance circuits; filter center frequency; flat passband response; frequency-dependent inductor losses; frequency-dependent negative resistance; low insertion loss; resonator loss; trace parasitic losses; transformer; Band pass filters; Chebyshev approximation; Coupling circuits; Distortion measurement; Electrical resistance measurement; Frequency measurement; Inductors; Insertion loss; Loss measurement; Passband; CMOS; LC filters; distortion; monolithic; noise; transformer;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2005.862348
