Title :
High selectivity varactor-tuned MMIC bandpass filter using lossless active resonators
Author :
Karacaoglu, U. ; Robertson, I.D.
Author_Institution :
Dept. of Electron. & Electr. Eng., King´s Coll., London, UK
Abstract :
A novel MMIC varactor-tuned bandpass filter technique using lossless active resonators has been demonstrated. The resonator has a simple topology and uses only one FET, and yet can produce high values of negative resistance to compensate for losses in the filter. A monolithic three-resonator lumped-element/active filter design has been realised with a chip area of 3/spl times/2 mm/sup 2/. The filter has a 120 MHz 3 dB bandwidth centred on 2.3 GHz, has 0 dB insertion loss with only /spl plusmn/0.1 dB ripple in the pass-band, and gives up to 100 dB of stop-band attenuation at low frequencies, and over 50 dB of rejection up to 6 GHz.<>
Keywords :
MMIC; active filters; active networks; band-pass filters; lumped parameter networks; microwave filters; negative resistance; resonators; tuning; varactors; 0 dB; 120 MHz; 2 mm; 2.3 GHz; 3 mm; 6 GHz; FET; chip area; insertion loss; lossless active resonators; monolithic three-resonator lumped-element/active filter; negative resistance; rejection; ripple; selectivity; stop-band attenuation; topology; varactor-tuned MMIC bandpass filter; Active filters; Attenuation; Band pass filters; Bandwidth; FETs; Frequency; Insertion loss; MMICs; Resonator filters; Topology;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335558
