Title :
Varactor-tuned active bandpass filter with low noise performance
Author :
Kim, B.-W. ; Chun, Y.H. ; Yun, S.W.
Author_Institution :
Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea
fDate :
7/22/2004 12:00:00 AM
Abstract :
An active tunable bandpass filter based upon the negative resistance method using a microstrip combline network is presented. The negative resistance is realised using a common-drain series feedback structure. 0.4 octave tuning with significant improvement in passband performance was achieved and the noise performance was comparable with its passive counterpart.
Keywords :
active filters; band-pass filters; circuit noise; circuit tuning; comb filters; microstrip circuits; negative resistance circuits; varactors; active bandpass filter; common drain series feedback; coupling varactor diode; low noise performance; microstrip combline network; negative resistance method; octave tuning; passband bandwidth; varactor tuned filter;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20045109
