DE2706224A1 - Digital tunable frequency generator - has oscillator frequency and phase compared with reference frequency to generate width modulated pulses - Google Patents

Digital tunable frequency generator - has oscillator frequency and phase compared with reference frequency to generate width modulated pulses

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Publication number
DE2706224A1
DE2706224A1 DE19772706224 DE2706224A DE2706224A1 DE 2706224 A1 DE2706224 A1 DE 2706224A1 DE 19772706224 DE19772706224 DE 19772706224 DE 2706224 A DE2706224 A DE 2706224A DE 2706224 A1 DE2706224 A1 DE 2706224A1
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DE
Germany
Prior art keywords
frequency
oscillator
pulses
generator
control voltage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19772706224
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German (de)
Other versions
DE2706224C2 (en
Inventor
Bernd Dipl Ing Fritze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rohde and Schwarz GmbH and Co KG
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Rohde and Schwarz GmbH and Co KG
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Application filed by Rohde and Schwarz GmbH and Co KG filed Critical Rohde and Schwarz GmbH and Co KG
Priority to DE19772706224 priority Critical patent/DE2706224C2/en
Publication of DE2706224A1 publication Critical patent/DE2706224A1/en
Application granted granted Critical
Publication of DE2706224C2 publication Critical patent/DE2706224C2/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
    • H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
    • H03L7/0895—Details of the current generators
    • H03L7/0898—Details of the current generators the source or sink current values being variable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number

Abstract

The generator has a voltage controlled oscillator whose output frequency is applied through an adjustable frequency divider to a frequency and phase comparator. It is compared there with a reference frequency. The comparator delivers pulses whose width is proportional to phase deviation. An integrator derives from them correspondingly wide current pulses, integrated in a capacitor into the oscillator control voltage. Current intensity (i) of pulses (S) applied to the integrator (7)/capacitor (8) increases with the increasing oscillator frequency in accordance with the oscillator (1) control voltage (V).

Description

BESCHREIBUNGDESCRIPTION

Digital einstellbarer Frequenzgenerator Die Erfindung betrifft einen digital einstellbaren Frequenzgenerator mit einem spannungsgesteuerten Oszillator, dessen Ausgangsfrequenz über einen einstellbaren Frequenzteiler einer Frequenz-und Phasenvergleichsschaltung zugeführt und dort mit einer Referenzfrequenz verglichen wird und durch welche periodisch Impulse erzeugt werden deren Breite der Phasenabweichung proportional ist und mit denen in einem Integrator entsprechend breite Stromimpulse erzeugt und in einem Kondensator zur Steuerspannung für den Oszillator integriert werden. Digitally adjustable frequency generator The invention relates to a digitally adjustable frequency generator with a voltage-controlled oscillator, its output frequency via an adjustable frequency divider of a frequency and Phase comparison circuit supplied and compared there with a reference frequency and through which periodic pulses are generated, the width of the phase deviation is proportional and with those in an integrator correspondingly wide current pulses generated and integrated in a capacitor for the control voltage for the oscillator will.

Bei Frequenzgeneratoren dieser Art nimmt die auf die Referenzfrequenz bezogene Regelsteilheit des spannungsgesteuerten Oszillators einerseits mit zunehmendem Teilungsfaktor und andererseits wegen der Regelkennlinie der in solchen Oszillatoren meist verwendeten Varakterdioden mit zunehmender Frequenz ab. Wenn ein solcher Generator in einem grossen Frequenzbereich durch entsprechende Einstellung des Teilungsfaktors des Frequenzteilers einstellbar ist oder die Regelkennlinie des spannungsgesteuerten Oszillators selbst stark gekrümmt ist, nimmt daher die Regelgeschwindigkeit im oberen Frequenzbereich stark ab und im unteren Frequenzbereich besteht die Gefahr eines Uberschwingens. Es könnte versucht werden, einen Ausgleich für diese Änderung der Regelsteilheit dadurch zu schaffen, dass die den Oszillator steurnde Steuerspannung beispielsweise über ein entsprechendes nichtlineares Glied geleitet wird.With frequency generators of this type, the takes on the reference frequency related control slope of the voltage-controlled oscillator on the one hand with increasing Division factor and on the other hand because of the control characteristic in such oscillators mostly used varactor diodes with increasing frequency. If such a generator in a large frequency range by setting the division factor accordingly of the frequency divider is adjustable or the control characteristic of the voltage-controlled Oscillator itself is strongly curved, therefore the control speed decreases in the upper Frequency range falls sharply and in the lower frequency range there is a risk of a Overshoot. An attempt could be made to compensate for this change in To create control steepness in that the control voltage controlling the oscillator for example passed through a corresponding non-linear element will.

hierdurch würde jedoch gegebenenfalls störendes Rauschen in die Regeischleife eingeschleppt werden.this would, however, possibly result in disturbing noise in the control loop be introduced.

Es ist daher Aufgabe der Erfindung, einen Frequenzgenerator der eingangs erwähnten Art so weiterzubilden und zu verbessern, dass mit einfachen Mitteln ohne zusätzliche Nachteile diese Beeinflussung der Regelsteilheit kompensiert ist.It is therefore the object of the invention to provide a frequency generator of the initially mentioned mentioned type to further educate and improve that with simple means without additional disadvantages this influencing of the control steepness is compensated.

Diese Aufgabe wird ausgehend von einem Frequenzgenerator der eingangs erwähnten Art erfindungsgemäss dadurch gelöst, dass die Stromstärke der dem Kondensator des Integrators zugeführten Stromimpulse in Abhängigkeit von der Steuerspannung des Oszillators mit wachsender Oszillatorfrequenz zunimmt.This task is carried out on the basis of a frequency generator from the introduction mentioned type according to the invention in that the current strength of the capacitor of the integrator supplied current pulses as a function of the control voltage of the oscillator increases as the oscillator frequency increases.

Durch die erfindungsgemässe Massnahme ist es möglich, die Regelgeschwindigkeit des Oszillators auch in einem grossen Frequenzbereich gleich gross zu halten, so dass ein erfindungsgemässer Frequenzgenerator im gesamten Frequenzband unabhängig von dem Teilungsfaktor des zwischengeschalteten Frequenzteilers und auch unabhängig von der Krümmung der Regelkennlinie des Oszillators auf Störungen schnell und genau reagiert. Die erfindungsgemässe Beeinflussung der Stramstärke der dem Kondensator zugeführten Stromimpulse, mit welcher zusätzlich zu der phasenabhängigen Impulsbreitenänderung eine weitere Regelgrösse in Abhängigkeit von der jeweils eingestellten Oszillatorfrequenz der Gesamtregelung überlagert wird, kann sehr einfach realisiert werden, da es lediglich erforderlich ist, die im Integrator vorgesehene Stromquelle in Abhängigkeit von der der Oszillatorfrequenz proportionalen Steuerspannung entsprechend zu steuern. Für die praktische Ausführung einer solchen gesteuerten Stromquelle gibt es die verschiedenartigsten bekannten Möglichkeiten.The measure according to the invention makes it possible to adjust the control speed of the oscillator to keep the same size in a large frequency range, so that a frequency generator according to the invention is independent in the entire frequency band of the division factor of the intermediate frequency divider and also independent from the curvature of the control characteristic of the oscillator to disturbances quickly and accurately reacted. The influencing according to the invention of the current strength of the capacitor supplied current pulses, with which in addition to the phase-dependent pulse width change another controlled variable depending on the oscillator frequency set in each case the overall control is superimposed can be implemented very easily, since it is only is required, the power source provided in the integrator as a function of to control the control voltage proportional to the oscillator frequency accordingly. For the practical implementation of such a controlled current source there is the various known possibilities.

Die erfindungsgemässe Massnahme ist insbesondere für in einem grossen Frequenzbereich also auch in einem grossen Xnderungsbereich des Frequenzteilers arbeitende Frequenzgeneratoren geeignet, da insbesondere durch den Teilungsfaktor die Regelsteilheit stark beeinflusst wird.The measure according to the invention is in particular for a large extent Frequency range also in a large range of change of the frequency divider working frequency generators are suitable, especially due to the division factor the steepness of the control is strongly influenced.

Die Erfindung ist jedoch auch für in kleineren Frequenzbereichen digital abstimmbare Frequenzgeneratoren dieser Art geeignet, bei denen die Regelsteilheit durch eine starke Krümmung der Regelkennlinie in gleicher Weise störend beeinflusst ist. In letzteren Anwendungsfällen ist neben der Phasenvergleichsschaltung keine zusätzlicht Frequenzvergleichsschaltung nötig, es genügt hier eine reine Phasenvergleichsschaltung, da der Fangbereich Ja nicht so gross ist.However, the invention is also digital for smaller frequency ranges tunable frequency generators of this type are suitable, in which the control steepness influenced in the same way by a strong curvature of the control characteristic is. In the latter cases, there is no phase comparison circuit in addition to the phase comparison circuit additional frequency comparison circuit required, a pure phase comparison circuit is sufficient here, because the catch area is not that big.

Die Erfindung wird im folgenden anhand einer schematischen Zeichnung an einem Ausführungsbeispiel näher erläutert.The invention is illustrated below with reference to a schematic drawing explained in more detail using an exemplary embodiment.

Die Figur zeigt einen digital einstellbaren Frequenzgenerator bestehend aus einem spannungsgesteuerten Oszillator 1 mit positiver oder negativer Steuerspannungs-Frequenz-Kennlinie. Die Ausgangsfrequenz t dieses Oszillators 1 wird einerseits dem Ausgang und andererseits einem über den Eingang 2 digital einstellbaren Frequenzteiler 3 zugeführt, dessen geteilte Ausgangsfrequenz einer Frequenz- und Phasenvergleichsschaltung 4 zugeführt wird, in welcher diese heruntergeteilte Oszillatorfrequenz mit einer in einem Generator 5 erzeugten Referenzfrequenz fr verglichen wird. In dieser Frequenz- und Phasenvergleichsschaltung wird periodisch, d.h.The figure shows a digitally adjustable frequency generator consisting from a voltage-controlled oscillator 1 with a positive or negative control voltage-frequency characteristic. The output frequency t of this oscillator 1 is on the one hand the output and on the other hand a digitally adjustable frequency divider 3 via the input 2, the divided output frequency of a frequency and phase comparison circuit 4 supplied in which this divided oscillator frequency with one in a generator 5 generated reference frequency fr is compared. In this frequency and phase comparison circuit becomes periodic, i.e.

vorzugsweise in jeder Periode der Referenzfrequenz fr bzw. der geteilten Oszillatorfrequenz fa ein Spannungs- und Stromimpuls erzeugt, welcher in der Breite der jeweiligen Phasenabweichung der beiden verglichenen Frequenzen proportional ist, Die Frequenz-und Phasenvergleichsschaltung 4 liefert ausserdem eine Information über die Polarität der Phasenabweichung. Diese Frequenz- und Phasenvergleichsschaltung 4 steuert über eine Wirkverbindung 6 einen Integrator 7, in welchem aus einer Stromquelle 10, 11 Stromimpulse S einem Kondensator 8 mit in bekannter Weise zum Schutz vor Regelschwingungen reduzierter Güte zugeführt werden.preferably in each period of the reference frequency fr or the divided Oscillator frequency fa generates a voltage and current pulse which is wide proportional to the respective phase deviation of the two compared frequencies The frequency and phase comparison circuit 4 also supplies information above the polarity of the phase deviation. This frequency and phase comparison circuit 4 controls via an operative connection 6 an integrator 7, in which from a current source 10, 11 current pulses S with a capacitor 8 in a known manner to protect against Control vibrations of reduced quality are fed.

Die Breite der Stromimpulse S ist gleich der Breite der in der Frequenz- und Phasenvergleichsschaltung 4 erzeugten Impulse, also wiederum proportional der jeweiligen Phasenabweichung. Die Polarität der Stromimpulse S entspricht der Polarität der Phasenabweichung. In dem gezeigten Ausführungsbeispil wird dies durch einen schematisch angedeuteten Schalter 9 erreicht, der in Abhängigkeit von den in der Frequenz- und Phasenvergleichsschaltung 4 erzeugten Impulsen gesteuert ist und der je nach Polarität der festgestellten Phasenabweichung entweder die einen positiven Strom +i liefernde Stromquelle 10 oder die einen negativen Strom -i liefernde Stromquelle 11 mit dem Kondensator 8 verbindet. In dem Kondensator 8 werden die so zugeführten positiven oder negativen Stromimpulse S zu einer Steuerspannung V integriert, mit welcher der spannungsgesteuerte Oszillator 1 in der Frequenz entsprechend nachgestimmt wird.The width of the current pulses S is equal to the width of the frequency and phase comparison circuit 4 generated pulses, so again proportional to the respective phase deviation. The polarity of the current pulses S corresponds to the polarity the phase deviation. In the exemplary embodiment shown, this is indicated by a schematically indicated switch 9 achieved, depending on the in the Frequency and phase comparison circuit 4 generated pulses is controlled and the depending on the polarity of the phase deviation detected, either the one positive Current source 10 delivering current + i or the current source delivering a negative current -i 11 connects to the capacitor 8. In the capacitor 8 are thus supplied positive or negative current pulses S integrated into a control voltage V, with which the voltage-controlled oscillator 1 is tuned accordingly in frequency will.

Gemäss der Erfindung wird zusätzlich die Stromstärke i der dem Kondensator 8 zugeführten Stromimpulse S sc geregelt, dass sie mit zunehmender Oszillatorfrequenz fa grösser wird. Nachdem die Steuerspannung V immer eindeutig dieser Oszillatorfrequenz zugeordnet ist, kann diese Steuerspannung V als einfaches Regelkriterium hierfür ausgenutzt werden. Es ist lediglich erforderlich, die die Stromimpulse S liefernde Stromquelle, in dem gezeigten Ausführungsbeispiel die beiden Stromquellen 10 und 11, in Abhängigkeit von dieser Steuerspannung V zu regeln, wie dies durch die Regelschleife 12 mit dem zwischengeschalteten Impedanzwandler 13 schematisch angeduetet ist. Je nachdem, ob der Oszillator 1 eine positive oder negative Steuerspannungs-Frequenz-Kennlinie besitzt, muss die Stromstärke i der Stromimpulse S umso grösser sein je höher oder niedriger die Steuerspannung V ist.According to the invention, the current intensity i is additionally that of the capacitor 8 supplied current pulses S sc regulated that they with increasing oscillator frequency fa gets bigger. After the control voltage V is always clearly this oscillator frequency is assigned, this control voltage V can be used as a simple control criterion for this be exploited. It is only necessary that the current pulses S delivering Current source, in the embodiment shown, the two current sources 10 and 11, to be regulated as a function of this control voltage V, as is done by the control loop 12 with the impedance converter 13 connected in between is indicated schematically. Ever according to whether the oscillator 1 has a positive or negative control voltage-frequency characteristic owns, must Current intensity i of the current pulses S is all the greater the higher or lower the control voltage V is.

Im allgemeinen genügt ein linearer Zusammenhang zwischen der Steuerspannung V und der entsprechenden Änderung der Stromstärke i, jedoch kann in bestimmten Fällen auch ein anderer nichtlinearer Zusammenharig gewählt werden, um hiermit beispielsweise zusätzliche weitere Anderungen in der Generatorregelschleife auszugleichen.In general, a linear relationship between the control voltage is sufficient V and the corresponding change in the current i, however, can in certain cases Another non-linear relationship can also be selected, for example to compensate for additional changes in the generator control loop.

Für die praktische Ausführungsform der gesteuerten Stromquelle 10 und 11 gibt es die verschiedenartigsten bekannten Lösungen, beispielsweise einfache mit Transistoren aufgebaute Schaltungen. In dem Ausführungsbeispiel sind nur zur besseren Ubersicht zwei getrennte Stromquellen dargestellt, es könnte genauso gut nur eine einzige entsprechend in der Stromstärke gesteuerte Stromquelle vorgesehen sein, der eine in Abhängigkeit von der Frequenz- und Phasenvergleichsschaltung 4 gesteuerte Stromumpolschaltung zugeordnet ist.For the practical embodiment of the controlled current source 10 and 11 there are a wide variety of known solutions, for example simple ones circuits constructed with transistors. In the embodiment are only for better overview two separate power sources shown, it could just as well only a single current source with a correspondingly controlled current intensity is provided the one depending on the frequency and phase comparison circuit 4 controlled Stromumpolschalt is assigned.

Patentansprüche Claims

Claims (1)

Patentanspruch Digital einstellbarer Frequenzgenerator mit einem spannungsgesteuerten Oszillator, dessen Ausgangsfrequenz über einen einstellbaren Frequenzteiler einer Frequenz- und Phasenvergleichsschaltung zugefUhrt und dort mit einer Referenzfrequenz verglichen wird und durch welche periodisch Impulse erzeugt werden deren Breite der Phasenabweichung proportional ist und mit denen in einem Integrator entsprechend breite Stromimpulse erzeugt und in einem Kondensator zur Steuerspannung für den Oszillator integriert werden, d a d u r c h g e -k e n n z e i ch n e t, dass die Stromstärke (i) der dem Kondensator (8) des Integrators (7) zugeführten Stromimpulse (S) in Abhängigkeit von der Steuerspannung (V) des Oszillators (1) mit wachsender Oszillatorfrequenz (fA) ) zunimmt. Claim Digitally adjustable frequency generator with a voltage controlled oscillator, the output frequency of which is adjustable Frequency divider fed to a frequency and phase comparison circuit and there is compared with a reference frequency and through which pulses are generated periodically are the width of the phase deviation is proportional and with those in one Integrator generated correspondingly wide current pulses and used in a capacitor Control voltage for the oscillator can be integrated, d a d u r c h g e -k e n n n z e i ch n e t that the current strength (i) of the capacitor (8) of the integrator (7) supplied current pulses (S) depending on the control voltage (V) of the Oscillator (1) increases with increasing oscillator frequency (fA)).
DE19772706224 1977-02-14 1977-02-14 Digitally adjustable frequency generator Expired DE2706224C2 (en)

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DE2706224C2 DE2706224C2 (en) 1985-01-10

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025876A1 (en) * 1979-09-20 1981-04-01 Robert Bosch Gmbh Multichannel radiotelephone equipment
FR2471703A1 (en) * 1979-12-10 1981-06-19 Sony Corp LOOP CIRCUIT LOCKED IN PHASE
EP0045795A1 (en) * 1980-02-20 1982-02-17 Motorola Inc Synchronized frequency synthesizer with high speed lock.
EP0046916A1 (en) * 1980-08-19 1982-03-10 Agfa-Gevaert AG Film feeding equipment, in particular projector
DE3120930A1 (en) * 1981-05-26 1982-12-16 Siemens AG, 1000 Berlin und 8000 München Integrable tracking-type synchronisation circuit
FR2511563A1 (en) * 1981-08-14 1983-02-18 Trt Telecom Radio Electr PHASE LOCKING DEVICE FOR PROVIDING TO ITS OUTPUT SIGNALS WHOSE FREQUENCY CAN VARY OVER A WIDE RANGE
EP0075332A2 (en) * 1981-09-23 1983-03-30 Siemens Aktiengesellschaft Receiver circuit
EP0076009A1 (en) * 1981-09-25 1983-04-06 Koninklijke Philips Electronics N.V. Tuning circuit incorporating a frequency synthesizer circuit
EP0195500A2 (en) * 1985-02-01 1986-09-24 Advanced Micro Devices, Inc. Charge-pump circuit for a phase-locked loop
EP0196868A2 (en) * 1985-03-29 1986-10-08 Motorola, Inc. Frequency synthesizer modulation response linearization
EP0415649A2 (en) * 1989-09-01 1991-03-06 Delco Electronics Corporation Compensated phase locked loop circuit
WO2000014922A1 (en) * 1998-09-03 2000-03-16 Gennum Corporation Slew phase locked loop

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DE4342344C2 (en) * 1993-12-11 1996-07-25 Telefunken Microelectron Circuit arrangement for a phase locked loop

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DE2029475A1 (en) * 1970-06-15 1971-12-23 Rohde & Schwarz Circuit for regulating the frequency of an oscillator on a digitally given setpoint value
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DE2029475A1 (en) * 1970-06-15 1971-12-23 Rohde & Schwarz Circuit for regulating the frequency of an oscillator on a digitally given setpoint value
DE2238964A1 (en) * 1972-08-08 1974-02-28 Licentia Gmbh FREQUENCY CONTROL ARRANGEMENT
DE2344078A1 (en) * 1973-08-31 1975-03-13 Siemens Ag Oscillator synchronised with reference oscillation - is synchronised by phase discriminator directly or after frequency division
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025876A1 (en) * 1979-09-20 1981-04-01 Robert Bosch Gmbh Multichannel radiotelephone equipment
FR2471703A1 (en) * 1979-12-10 1981-06-19 Sony Corp LOOP CIRCUIT LOCKED IN PHASE
EP0045795A1 (en) * 1980-02-20 1982-02-17 Motorola Inc Synchronized frequency synthesizer with high speed lock.
EP0045795A4 (en) * 1980-02-20 1982-07-13 Motorola Inc Synchronized frequency synthesizer with high speed lock.
EP0046916A1 (en) * 1980-08-19 1982-03-10 Agfa-Gevaert AG Film feeding equipment, in particular projector
DE3120930A1 (en) * 1981-05-26 1982-12-16 Siemens AG, 1000 Berlin und 8000 München Integrable tracking-type synchronisation circuit
FR2511563A1 (en) * 1981-08-14 1983-02-18 Trt Telecom Radio Electr PHASE LOCKING DEVICE FOR PROVIDING TO ITS OUTPUT SIGNALS WHOSE FREQUENCY CAN VARY OVER A WIDE RANGE
EP0072593A1 (en) * 1981-08-14 1983-02-23 Telecommunications Radioelectriques Et Telephoniques T.R.T. Phase-lock device for supplying at its output signals whose frequency may vary over a wide band
EP0075332A2 (en) * 1981-09-23 1983-03-30 Siemens Aktiengesellschaft Receiver circuit
EP0075332A3 (en) * 1981-09-23 1983-09-07 Siemens Aktiengesellschaft Receiver circuit
EP0076009A1 (en) * 1981-09-25 1983-04-06 Koninklijke Philips Electronics N.V. Tuning circuit incorporating a frequency synthesizer circuit
EP0195500A2 (en) * 1985-02-01 1986-09-24 Advanced Micro Devices, Inc. Charge-pump circuit for a phase-locked loop
EP0195500A3 (en) * 1985-02-01 1988-04-27 Advanced Micro Devices, Inc. Charge-pump circuit for a phase-locked loop
EP0196868A2 (en) * 1985-03-29 1986-10-08 Motorola, Inc. Frequency synthesizer modulation response linearization
EP0196868A3 (en) * 1985-03-29 1988-11-02 Motorola, Inc. Frequency synthesizer modulation response linearization
EP0415649A2 (en) * 1989-09-01 1991-03-06 Delco Electronics Corporation Compensated phase locked loop circuit
EP0415649A3 (en) * 1989-09-01 1991-05-22 Delco Electronics Corporation Compensated phase locked loop circuit
WO2000014922A1 (en) * 1998-09-03 2000-03-16 Gennum Corporation Slew phase locked loop

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