Dual conversion FM receiver using phase locked direct conversion

Details Dual conversion FM receiver using phase locked direct conversion Dual conversion FM receiver using phase locked direct conversion

1985-11-18

1987-03-24

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455256, 455258, 455259, 455260, 455264, 455316, 455324, H04B 116, H04B 130

Patent

active

046531173

ABSTRACT:
A receiver for frequency modulated signals, having down-conversion to a baseband, zero intermediate frequency for selectivity, followed by up-conversion to a non-zero IF for amplification, limiting, and demodulation.
A phase-lock loop locks the frequency of the down-conversion source to the center frequency of the signal coupled to the baseband IF, converting the signal to precisely zero frequency. This avoids the beat note often found in direct conversion systems. The phase-lock loop additionally provides inherent demodulation of the FM signal.
The received FM signal is coupled to the baseband IF through a radio frequency amplifier for improved sensitivity and local oscillator isolation, or through a first IF comprising a mixer, local oscillator, filter, and amplifier.

REFERENCES:
patent: 3480865 (1969-11-01), Sanders
patent: 3614627 (1971-10-01), Runyan
patent: 3961262 (1976-06-01), Gassmann
patent: 4057759 (1977-11-01), Genova et al.
patent: 4193035 (1980-03-01), Berger
patent: 4246653 (1981-01-01), Malm
patent: 4313211 (1982-01-01), Leland
patent: 4384357 (1983-05-01), deBuda et al.
patent: 4408351 (1983-10-01), Maurer et al.

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