Constant bandwidth RF filter with improved low frequency attenua

Details Constant bandwidth RF filter with improved low frequency attenua Constant bandwidth RF filter with improved low frequency attenua

1985-12-31

1987-02-24

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455191, 455197, 455340, 334 15, 333174, H04B 126, H03H 701

Patent

active

046463607

ABSTRACT:
A television tuner has a tuned circuit at the input of an RF amplifier. The tuned circuit has a varactor tuned parallel circuit and an output series coil for good high frequency attenuation and constant bandwidth with changes in frequency. For good low frequency attenuation, an input series capacitance is provided comprising a pair of varactors. The varactor pair is oppositely poled to reduce frequency doubling of low frequency signals.

REFERENCES:
patent: 3354397 (1967-11-01), Wittig
patent: 3582823 (1971-06-01), Pasos
patent: 3628152 (1971-12-01), Carlson
patent: 3646449 (1972-02-01), Hellbarth et al.
patent: 3684977 (1972-08-01), Viles
patent: 3693096 (1972-09-01), Dosey et al.
patent: 3825858 (1974-07-01), Amemiya et al.
patent: 4061981 (1977-12-01), Endres et al.
patent: 4075580 (1978-02-01), Sunkler
patent: 4186350 (1980-01-01), Takayama

Affiliated with

Also associated with

Rating

Constant bandwidth RF filter with improved low frequency attenua does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Constant bandwidth RF filter with improved low frequency attenua, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constant bandwidth RF filter with improved low frequency attenua will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-114677