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1. EP1780887 - FM DETECTION CIRCUIT

Office
European Patent Office
Application Number 05765212
Application Date 04.07.2005
Publication Number 1780887
Publication Date 02.05.2007
Publication Kind A4
IPC
H03D 7/14
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
7Transference of modulation from one carrier to another, e.g. frequency-changing
14Balanced arrangements
H03D 3/26
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
3Demodulation of angle-modulated oscillations
26by means of sloping amplitude/frequency characteristic of tuned or reactive circuit
CPC
H03D 3/26
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
3Demodulation of angle-, ; frequency- or phase-; modulated oscillations
26by means of sloping amplitude/frequency characteristic of tuned or reactive circuit
H03D 2200/0023
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
2200Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
0001Circuit elements of demodulators
0023Balun circuits
H03H 11/32
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
11Networks using active elements
02Multiple-port networks
32Balance-unbalance networks
H04L 27/148
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
10Frequency-modulated carrier systems, i.e. using frequency-shift keying
14Demodulator circuits; Receiver circuits
144with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
148using filters, including PLL-type filters
Applicants MURATA MANUFACTURING CO
Inventors KATO AKIRA
Designated States
Priority Data 2004240379 20.08.2004 JP
Title
(DE) SCHALTUNG FÜR FM-ERKENNUNG
(EN) FM DETECTION CIRCUIT
(FR) CIRCUIT DE DÉTECTION FM
Abstract
(EN) An FM detector circuit includes an unbalanced/balanced conversion circuit (2), a signal synthesis circuit (3), a parallel circuit including a first diode (D1) connected between a first balanced output terminal of the unbalanced/balanced conversion circuit (2) and one signal input terminal of the signal synthesis circuit (3) and a resonator (X1), a parallel circuit including a second diode (D2) connected between a second balanced output terminal of the unbalanced/balanced conversion circuit (2) and the other signal input terminal of the signal synthesis circuit (3) and a capacitor element (C1), and a low-pass filter (4) connected to an output terminal of the signal synthesis circuit (3).
(FR) Circuit de détection FM comprenant un circuit de conversion déséquilibrage/équilibrage (2), un circuit de synthèse de signal (3), un circuit parallèle se composant d’une première diode (D1) et d’un résonateur (X1) et connecté entre la première borne de sortie équilibrée du circuit de conversion déséquilibrage/équilibrage (2) et une première borne d’entrée de signal du circuit de synthèse de signal (3), un circuit parallèle se composant d’une seconde diode (D2) et d’un élément de capacité (C1) et connecté entre la seconde borne de sortie équilibrée du circuit de conversion déséquilibrage/équilibrage (2) et l’autre borne d’entrée de signal du circuit de synthèse de signal (3), ainsi qu’un filtre passe-bas (4) connecté à la borne de sortie du circuit de synthèse de signal (3).
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