Filter and demodulation circuit for filtering an intermediate fr

Details Filter and demodulation circuit for filtering an intermediate fr Filter and demodulation circuit for filtering an intermediate fr

1988-03-02

1990-02-20

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455312, 455337, 455340, 329315, H04B 116

Patent

active

049033328

ABSTRACT:
Intermediate frequency signals are produced by mixing with an oscillator voltage and subsequently filtered and demodulated. The oscillator voltage or the resonance frequency of the filter or filters are followed up by a control voltage derived from the demodulated signal corresponding to the intermediate frequency. The perturbatory phase modulator occurring as a result of the control lag is compensated by opposite-phase phase-modulation which is superimposed on the intermediate frequency. In this, the phase modulation is achieved by a phase modulator which is connected with the output of a demodulator by a matching circuit. Another possibility for achieving phase modulation of the intermeidate frequency is to modulate the oscillator of the mixing stage.

REFERENCES:
patent: 2262945 (1941-11-01), Kircher
patent: 3150323 (1964-09-01), Stavis et al.
patent: 3329900 (1967-07-01), Graves
patent: 3428900 (1969-02-01), Newton
patent: 3568066 (1971-03-01), Fujimura
patent: 3614627 (1971-10-01), Runyan
patent: 3626301 (1971-12-01), Develet, Jr.
patent: 3798550 (1974-03-01), Takaoka
patent: 3922609 (1975-11-01), Grohmann
patent: 3936753 (1976-02-01), Clark
patent: 3961262 (1976-06-01), Gassmann
patent: 4091410 (1978-05-01), Citta
patent: 4156255 (1979-05-01), Hongu et al.
patent: 4263675 (1981-04-01), Hongri et al.
patent: 4293818 (1981-10-01), Jarger
patent: 4435843 (1984-03-01), Eilers et al.
patent: 4569085 (1986-02-01), Nolde et al.
patent: 4605904 (1986-08-01), Haji-Chehade
patent: 4653117 (1987-08-01), Heck
patent: 4658438 (1987-04-01), Kamata et al.
patent: 4761829 (1988-08-01), Lynk, Jr. et al.
patent: 4776039 (1988-10-01), Akaiwa

Affiliated with

Also associated with

Rating

Filter and demodulation circuit for filtering an intermediate fr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Filter and demodulation circuit for filtering an intermediate fr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter and demodulation circuit for filtering an intermediate fr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1622934