DE2847272A1 - Oscillator for VHF TV receiver - has RL circuit ensuring synchronism between oscillator and receive frequency over entire tuning range - Google Patents

Oscillator for VHF TV receiver - has RL circuit ensuring synchronism between oscillator and receive frequency over entire tuning range

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Publication number
DE2847272A1
DE2847272A1 DE19782847272 DE2847272A DE2847272A1 DE 2847272 A1 DE2847272 A1 DE 2847272A1 DE 19782847272 DE19782847272 DE 19782847272 DE 2847272 A DE2847272 A DE 2847272A DE 2847272 A1 DE2847272 A1 DE 2847272A1
Authority
DE
Germany
Prior art keywords
oscillator
circuit
vhf
tuning range
receiver
Prior art date
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
DE19782847272
Other languages
German (de)
Other versions
DE2847272C2 (en
Inventor
Volker Mueller
Josef Rehm
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.)
Telefunken Electronic GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19782847272 priority Critical patent/DE2847272C2/en
Publication of DE2847272A1 publication Critical patent/DE2847272A1/en
Application granted granted Critical
Publication of DE2847272C2 publication Critical patent/DE2847272C2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes

Abstract

The oscillator circuit has a series circuit consisting of a capacitor(14) and a variable inductor(15) connected to a junction between the inductors(3, 4) in the oscillator resonant circuit(1) and to earth. This ensures that the receive frequency and the oscillator frequency are synchronised over the entire width of the tuning range. The oscillator resonant circuit consists of a varactor diode(2) shunted by the two series inductors(3, 4), one of which is variable. A ferrite core(13) is connected between the tapping between these inductors and the series circuit capacitor(14) in order to damp the series circuit.

Description

Oszillatorschaltung Die vorliegeIide Erfindung bezieht sich auf eine Oszillatorschaltung für VHF-Empfangsfrequenzen von Efrpfangsgeräten der Nachrichtentechnik, insbesondere Fernseh-Empfangsgeräten. Oscillator Circuit The present invention relates to a Oscillator circuit for VHF reception frequencies from Efrpfangsgeräte of the communication technology, in particular television receivers.

In dem Empfangsteil des Empfangsgerätes für die VHF-Kanäle schwingt der Oszillator um die Zwischenfrequenz entweder oberhalb oder unterhalb der Empfangsfrequenz. Das Bandfilter, welches auf die Eingangsfrequenz abgestimmt ist, durchläuft immer den gleich großen Frequenzbereich. Durch den unterschiedlich schwingenden Oszillator ist der relative Oszillatorfrequenzbereich verschiedeli groß, so daß ein optimaler Gleichlauf zwischen Bandfilter und Oszillator zum Beispiel nur im überlagerten Zustand erreicht wird Schwingt der Oszillator unterhalb der Empfangsfrequenz können zwar uie Anfangs- und Endfrequenzen im Gleichlauf eingestellt werden, in der Bereichsmitte dagegen besteht dann keine Nöglichkeit mehr den Gleichlauf zu beeinflussen Es ist bereits bekanut, durch die Verwendung von bipolaren Transistoren die Bandfilterkreise relativ stark zu bedämpfen, so daß ein Gleichlauffehler vernachlässigt werLe. kann.In the receiving part of the receiving device for the VHF channels oscillates the oscillator around the intermediate frequency either above or below the receiving frequency. The band filter, which is tuned to the input frequency, always passes the same large frequency range. Because of the different oscillating oscillator the relative oscillator frequency range is different, so that an optimal Synchronism between band filter and oscillator, for example, only achieved in the superimposed state If the oscillator oscillates below the receiving frequency, the initial and end frequencies can be set in synchronism, but in the middle of the range there is then no longer any possibility of influencing the synchronism It is already known, through the use of bipolar transistors, the band filter circuits are relatively to be attenuated strongly, so that a synchronization error is neglected. can.

Diese Maßnahme hat jedoch crl nachteil, daß sich durch aic schlechtere Kreisgüte des Bandfilters sich die geringere Selektion und deren Folgeerscheinungen negativ auf verschiedene elektrische Werte auswirkt Mit der vorliegenden Erfindung soll die Aufgabe gelöst werden, unter Vermeidung der obei. angeführten Nachteile einen Ozzillator in einfacher Weise mit dem vorgeschalteten Eingangsbandfilter für die VHF-EmpSangsfrequenzen im gesamten Abstimribereich in Gleichlauf zu bringen Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs wiedergegebene Lehre gelöst.However, this measure has the disadvantage that aic results in worse Circular quality of the band filter, the lower selection and its consequences adversely affect various electrical values with the present invention the task should be solved while avoiding the obei. listed disadvantages an oscillator in a simple way with the upstream input band filter for to bring the VHF reception frequencies in sync in the entire tuning range According to the invention, this object is achieved by what is recited in the characterizing part of the claim Teaching solved.

Ein praktisches Ausführungsbeispiel der Erfindung ist in der Figur 1 dargestellt und im nachfolgenden beschrieben.A practical embodiment of the invention is shown in the figure 1 and described below.

Der Oszillatorschwingkreis 1 ist aus der Kapazitätsdiode 2 und den parallel geschalteten Induktivitäten 3 und 4 gebildet An die Verbindungsleitung der beiden Induktivitäten 3 und 4 ist der Serienkreis, gebildet aus der Kapazität 14 und der abgleichbaren Induktivität 15 angekoppelt. Der zweite Abgriff der abstimmbaren Induktivität 15 ist an Masse gelegt. Die Wirkungsweise ist im nachfolgenden beschrieben.The oscillator circuit 1 is made up of the capacitance diode 2 and the Inductors 3 and 4 connected in parallel are formed on the connecting line of the two inductances 3 and 4 is the series circuit, formed from the capacitance 14 and the adjustable inductance 15 are coupled. The second tap of the tunable Inductance 15 is on Ground. The mode of action is as follows described.

Bei Resonanz des Serienkreises wird dem Schwingkreisteil des Oszillators 1 eine relativ kleine Impedanz parallel geschaltet. Dadurch wird die Induktivität der Teilspule 4 verkleinert und die Gesamtinduktivität des Oszillatorkreises 1 verringert. Dadurch tritt eine Oszillatorfrequenzänderung nach höheren Frequenzen ein Die Resonanzfrequenz des Serienschwingkreises wird auf die Frequenz gelegt, bei der der Oszillator 1 den größten Gleichlauffehler gegenüber dem HF-Bandfilter aufweist. Um einen sprunghaften Anstieg der Oszillatorfrequenz zu vermeiden, wird der Serienkreis durch einen Ferritkern 13 bedämpft.When the series circuit resonates, the resonant circuit part of the oscillator 1 a relatively small impedance connected in parallel. This will reduce the inductance the coil section 4 is reduced and the total inductance of the oscillator circuit 1 is reduced. This results in a change in the oscillator frequency towards higher frequencies. The resonance frequency of the series resonant circuit is set to the frequency at which oscillator 1 has the largest synchronization error compared to the HF band filter. To a volatile To avoid rise in the oscillator frequency, the series circuit is made by a ferrite core 13 damped.

Claims (1)

Patentanspruch Oszillatorschaltung für VHF-Empfangsfrequenzen von Empfangsgeräten der Nachrichtentechnik, insbesondere Fernseh-Ernpfangsgeräten, dadurch gekennzeichnet, daß durch Ankoppplung eines Serienkreises, bestehend aus einer Kapazität (14) und einer abgleichbaren Induktivität (15) an einen Abgriff der Induktivitäten (3, 4) des Oszillatorschwingkreises (1) und an Masse ein Gleichlauf der Empfangsfrequenz und der Oszillatorfrequenz über die gesamte Breite des Abstimmbereichs erreicht wirdClaim Oscillator circuit for VHF receiving frequencies from receiving devices communications technology, in particular television receivers, characterized in that that by coupling a series circuit consisting of a capacitance (14) and an adjustable inductance (15) to a tap of the inductances (3, 4) of the oscillator circuit (1) and a synchronization of the receiving frequency to ground and the oscillator frequency is reached over the entire width of the tuning range will
DE19782847272 1978-10-31 1978-10-31 Oscillator circuit Expired DE2847272C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782847272 DE2847272C2 (en) 1978-10-31 1978-10-31 Oscillator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782847272 DE2847272C2 (en) 1978-10-31 1978-10-31 Oscillator circuit

Publications (2)

Publication Number Publication Date
DE2847272A1 true DE2847272A1 (en) 1980-05-08
DE2847272C2 DE2847272C2 (en) 1982-10-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782847272 Expired DE2847272C2 (en) 1978-10-31 1978-10-31 Oscillator circuit

Country Status (1)

Country Link
DE (1) DE2847272C2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1591764B2 (en) * 1967-12-13 1972-02-17 Telefunken Patentverwertungsgesellschaft Mbh, 7900 Ulm OSCILLATOR CIRCUIT WITH A CAPACITIVELY TUNED PARALLEL RESONANCE CIRCUIT
DE2038737B2 (en) * 1969-08-04 1975-08-07 General Motors Corp., Detroit, Mich. (V.St.A.) Capacitive tunable two-pole circuit
DE2654382B1 (en) * 1976-12-01 1978-02-09 Saba Gmbh Stabilisation of tuned oscillator circuit - uses ferrite bead and capacitor to compensate for drift associated with diode characteristic

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1591764B2 (en) * 1967-12-13 1972-02-17 Telefunken Patentverwertungsgesellschaft Mbh, 7900 Ulm OSCILLATOR CIRCUIT WITH A CAPACITIVELY TUNED PARALLEL RESONANCE CIRCUIT
DE2038737B2 (en) * 1969-08-04 1975-08-07 General Motors Corp., Detroit, Mich. (V.St.A.) Capacitive tunable two-pole circuit
DE2654382B1 (en) * 1976-12-01 1978-02-09 Saba Gmbh Stabilisation of tuned oscillator circuit - uses ferrite bead and capacitor to compensate for drift associated with diode characteristic

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Funkschau 1966, H. 14, S. 445-447 *
radio fernsehen elektronik, 1969, H. 19, S. 600 *

Also Published As

Publication number Publication date
DE2847272C2 (en) 1982-10-21

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Legal Events

Date Code Title Description
OAP Request for examination filed
OD Request for examination
D2 Grant after examination
8327 Change in the person/name/address of the patent owner

Owner name: TELEFUNKEN ELECTRONIC GMBH, 7100 HEILBRONN, DE

8339 Ceased/non-payment of the annual fee