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1. US20070109041 - FM detector circuit with unbalanced/balanced conversion

Office
United States of America
Application Number 11616908
Application Date 28.12.2006
Publication Number 20070109041
Publication Date 17.05.2007
Grant Number 7518438
Grant Date 14.04.2009
Publication Kind B2
IPC
H04L 27/14
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
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., Ltd.
Inventors Kato Akira
Agents Keating &; Bennett, LLP
Priority Data 2004240379 20.08.2004 JP
Title
(EN) FM detector circuit with unbalanced/balanced conversion
Abstract
(EN)

An FM detector circuit includes an unbalanced/balanced conversion circuit, a signal synthesis circuit, a parallel circuit including a first diode connected between a first balanced output terminal of the unbalanced/balanced conversion circuit and one signal input terminal of the signal synthesis circuit and a resonator, a parallel circuit including a second diode connected between a second balanced output terminal of the unbalanced/balanced conversion circuit and the other signal input terminal of the signal synthesis circuit and a capacitor element, and a low-pass filter connected to an output terminal of the signal synthesis circuit.


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