Demodulators – Frequency modulation demodulator – Input signal combined with local oscillator or carrier...
Patent
1996-07-30
1998-10-27
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Input signal combined with local oscillator or carrier...
375327, 455260, 331 11, H03D 302, H03L 706, H03L 718
Patent
active
058282661
ABSTRACT:
The present invention concerns apparatus and method for setting up the tuning frequency of a PLL, demodulator that includes a VCO. Frequency synthesizing circuitry controls the VCO via a first switched control path. Comparison circuitry provides a first signal that corresponds to the difference between the output frequency of the VCO and a reference frequency. Control circuitry is provided that is responsive to a plurality of signals including the first signal for operatively controlling the apparatus. The apparatus further includes: a ceramic resonator oscillator for providing the reference frequency; a non-volatile memory for storing the value of the first signal; and comparison circuitry for comparing a stored value of the first signal with a current value of the first signal so as to produce a second signal for adjusting the tuning frequency of the frequency synthesizing circuitry in response to the second signal.
REFERENCES:
patent: 5493713 (1996-02-01), Horsfall et al.
patent: 5631601 (1997-05-01), Horsfall et al.
Dorny Brett N.
Grimm Siegfried H.
Morris James H.
SGS-Thomson Microelectronics S.A.
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