Title :
Intermodulation distortion in active microwave filters
Author :
Hunter, I.C. ; Chandler, S.R
Author_Institution :
Filtronic COMTEK Ltd., Shipley, UK
fDate :
2/1/1998 12:00:00 AM
Abstract :
Active microwave filters have potential application in high-volume consumer products such as cellular-radio handsets. Active negative-resistance circuits may be coupled into physically small low-Q-factor filter structures to cancel resonator losses and produce apparently ideal filter characteristics. However, at large input-signal levels, the nonlinear active devices cause distortion effects, particularly with multiple signal inputs. Results from an experimental and computer-simulation study of saturation and intermodulation distortion in active negative-resistance microwave bandpass and bandstop filters are presented. These results have been generalised into simple formulas to enable the designer to determine the level of distortion in any specific filter of this type
Keywords :
active filters; band-pass filters; band-stop filters; intermodulation distortion; microwave filters; negative resistance devices; nonlinear filters; nonlinear network synthesis; active microwave filters; active negative-resistance circuits; cellular-radio handsets; high-volume consumer products; input-signal level; intermodulation distortion; microwave bandpass filters; microwave bandstop filters; multiple signal input; nonlinear active devices; physically small low-Q-factor filter structures; resonator losses; saturation;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:19981453