H - Electricity – 03 – D
Patent
H - Electricity
03
D
H03D 3/00 (2006.01) H03D 3/24 (2006.01)
Patent
CA 2088187
An FM demodulation circuit comprises, an oscillation circuit means (3) whose oscillation frequency is variable by a control signal, a phase comparator means (2) for comparing phases of signals between an FM signal to be demodulated and the output signal of the oscillation circuit means (3) and generating a comparison signal corresponding to the phase difference, an additional voltage determining means (7) for determining an additional voltage based upon the comparison signal, and an adder means (5) for adding the comparison signal and the additional voltage, and supplying the added result as the control voltage. The additional voltage may be a value which makes the comparison signal level at a center level of the operable range of the phase comparator means (2).
'invention est un circuit de démodulation FM comportant un circuit oscillant (3) dont on peut faire varier la fréquence d'oscillation au moyen d'un signal de commande, un comparateur de phase (2) servant à comparer les phases d'un signal FM à démoduler et du signal de sortie du circuit oscillant (3) et à produire un signal de comparaison correspondant au déphasage entre ces signaux, d'un circuit de mesure de tension additionnelle (7) servant à déterminer une tension additionnelle à partir du signal de comparaison, et d'un additionneur (5) pour additionner le signal de comparaison et la tension additionnelle et fournir le résultat de l'addition comme tension de commande. La tension additionnelle peut être choisie de façon que le niveau du signal de comparaison se trouve au milieu de la gamme de valeurs opérationnelles du comparateur de phase (2).
Corporation Nec
G. Ronald Bell & Associates
LandOfFree
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