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1. WO2000025427 - FREQUENCY SYNTHESIZER

Publication Number WO/2000/025427
Publication Date 04.05.2000
International Application No. PCT/EP1999/007463
International Filing Date 28.09.1999
IPC
H03J 5/02 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
5Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
02with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
H03J 7/06 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
7Automatic frequency control; Automatic scanning over a band of frequencies
02Automatic frequency control
04where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
06using counters or frequency dividers
H03L 7/087 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
085concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
087using at least two phase detectors or a frequency and phase detector in the loop
H03L 7/089 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
085concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
089the phase or frequency detector generating up-down pulses
CPC
H03J 5/0272
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
5Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
02with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
0245Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
0272the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer
H03J 7/065
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
7Automatic frequency control; Automatic scanning over a band of frequencies
02Automatic frequency control
04where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
06using counters or frequency dividers
065the counter or frequency divider being used in a phase locked loop
H03L 7/087
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
085concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
087using at least two phase detectors or a frequency and phase detector in the loop
H03L 7/0891
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
085concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
089the phase or frequency detector generating up-down pulses
0891the up-down pulses controlling source and sink current generators, e.g. a charge pump
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL]
Inventors
  • VAUCHER, Cicero, S.
  • KASPERKOVITZ, Wolfdietrich, G.
Agents
  • SCHOENMAKER, Maarten
Priority Data
98203565.122.10.1998EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FREQUENCY SYNTHESIZER
(FR) SYNTHETISEUR DE FREQUENCES
Abstract
(EN)
Frequency synthesizers are used for down conversion of RF signals in a lot of applications such as digital and analog radio and television receivers, car radios id. By combining the voltage-controlled oscillator of the phase locked loop demodulator with the voltage controlled oscillator of the frequency synthesizer a major cost reduction can be achieved but measures have to be made to prevent that the two PLLs try to lock the same VCO to different frequencies. The invention provides a frequency synthesizer (FS3) whereby switching means (33) between the phase frequency comparator (31) and the charging means (35) are controlled by using a frequency window detector (371, 373, 375). The phase frequency detector (31) is disconnected from said charging means (35) when it is detected that the frequency difference between the frequency synthesizer input signals is lower than a predetermined value, whereafter said voltage-controlled oscillator (VC03) is only driven by an AFC signal.
(FR)
On utilise les synthétiseurs de fréquences pour le changement de fréquence de signaux haute fréquence dans de nombreuses applications, notamment dans des récepteurs radio ou des téléviseurs numériques et analogiques, ou des récepteurs auto-radio. On peut ainsi réduire considérablement les coûts en combinant l'oscillateur commandé en tension VCO du démodulateur à boucle à phase asservie PLL et l'oscillateur commandé en tension dudit synthétiseur de fréquences, tout en effectuant des mesures destinées à empêcher que les deux boucles PLL tentent de verrouiller le même oscillateur VCO sur différentes fréquences. Cette invention concerne donc un synthétiseur de fréquences (FS3) dans lequel un organe de commutation (33) placé entre un comparateur de phase (31) et un organe de charge (35) est commandé par un détecteur à fenêtre de fréquence (371, 373, 375). Le détecteur de phase (31) est déconnecté dudit organe de charge (35) lorsque la différence de fréquence entre les signaux d'entrée du synthétiseur de fréquences est inférieure à une valeur prédéterminée, après quoi ledit oscillateur commandé en tension (VC03) n'est régi que par un signal AFC.
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