DE1591764B2 - OSCILLATOR CIRCUIT WITH A CAPACITIVELY TUNED PARALLEL RESONANCE CIRCUIT - Google Patents
OSCILLATOR CIRCUIT WITH A CAPACITIVELY TUNED PARALLEL RESONANCE CIRCUITInfo
- Publication number
- DE1591764B2 DE1591764B2 DE19671591764 DE1591764A DE1591764B2 DE 1591764 B2 DE1591764 B2 DE 1591764B2 DE 19671591764 DE19671591764 DE 19671591764 DE 1591764 A DE1591764 A DE 1591764A DE 1591764 B2 DE1591764 B2 DE 1591764B2
- Authority
- DE
- Germany
- Prior art keywords
- capacitor
- frequency range
- circuit
- inductance
- capacitance
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/1262—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising switched elements
- H03B5/1268—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising switched elements switched inductors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
Außerdem ist von besonderem Vorteil, daß bei Verwendung von Schalterdioden zur Frequenzbereichumschaltung für die Zufuhr der Vorspannung für die Schalterdioden kein besonderer Gleichstromweg erforderlich wird, wie dies bei den bekannten Schaltungen notwendig ist. Bei letzteren muß nämlich der Verkürzungskapazität eine Drossel parallel geschaltet werden. Diese entfällt beim erfindungsgemäßen Schaltungsaufbau. It is also of particular advantage that when using switch diodes for frequency range switching no special direct current path is required for supplying the bias voltage for the switch diodes becomes, as is necessary in the known circuits. In the case of the latter, the Reduction capacity a choke can be connected in parallel. This does not apply to the circuit structure according to the invention.
Weitere vorteilhafte Einzelheiten der Erfindung sind nachfolgend an Hand eines in der Zeichnung veranschaulichten Ausführungsbeispiels beschrieben.Further advantageous details of the invention are illustrated below with reference to one in the drawing Embodiment described.
F i g. 1 zeigt eine bekannte Schaltung der eingangs beschriebenen Art undF i g. 1 shows a known circuit of the type described in the opening paragraph and
F i g. 2 die erfindungsgemäße Schaltung.F i g. 2 the circuit according to the invention.
Es sei angenommen, daß die Schaltungen für die Fernsehfrequenzbereiche Band I und Band III ausgelegt werden sollen.It is assumed that the circuits are designed for the television frequency ranges Band I and Band III should be.
In Fig. 1 besteht der Oszillator-Parallelresonanzkreis aus den Induktivitäten L1 und L2 in Reihe mit einem Verkürzungskondensator C4 im einen Parallel-, zweig und aus dem variablen Kondensator C2 und einem Verkürzungskondensator C3 im anderen Parallelzweig. Der Verbindungspunkt 1 ist durch einen Schalter 2 mit Masse verbindbar, wodurch die Induktivität L2 und der Verkürzungskondensator C4. überbrückt werden. Der Hochpunkt 3 des Parallelschwingkreises ist mit der Ausgangselektrode eines Verstärkerelementes 4 verbunden, und gleichzeitig ist zwischen dem Hochpunkt 3 und der Eingangselektrode des Verstärkerelementes 4 ein Rückkopplungskondensator C1 vorgesehen, der noch mit in die Kreiskapazität des Oszillatorkreises eingeht.In Fig. 1, the oscillator parallel resonance circuit consists of the inductors L 1 and L 2 in series with a shortening capacitor C 4 in a parallel branch and of the variable capacitor C 2 and a shortening capacitor C 3 in the other parallel branch. The connection point 1 can be connected to ground by a switch 2, as a result of which the inductance L 2 and the shortening capacitor C 4 . be bridged. The high point 3 of the parallel resonant circuit is connected to the output electrode of an amplifier element 4, and at the same time a feedback capacitor C 1 is provided between the high point 3 and the input electrode of the amplifier element 4, which is also included in the circular capacitance of the oscillator circuit.
Die Werte von C2 und C3 sind so ausgelegt, daß bei geschlossenem Schalter 2 eine Kapazitätsvariation von 1,24, d. h. im Band III von 266 bis 214 MHz, erzielbar ist. Bei Umschaltung auf Band I, d. h. durch Offnen des Schalters 2, wird C4 in den Kreis eingeschaltet und durch diesen die Kapazitätsvariation auf 1,16 abgesenkt, so daß der Oszillator für Band I zwischen 101 und 87MHz durchstimmbar ist. Die Induktivität L1 ist in bekannter Weise für Band III und L1 + L2 für Band I ausgelegt. Wie an Hand der Fig. 1 leicht festzustellen, wird im Band-I-Betrieb der Resonanzwiderstand des Kreises durch den Kondensator C4 herabgedrückt, was aus folgender Gleichung ebenfalls ersichtlich ist:The values of C 2 and C 3 are designed in such a way that when switch 2 is closed, a capacity variation of 1.24, ie in band III from 266 to 214 MHz, can be achieved. When switching to band I, ie by opening switch 2, C 4 is switched on in the circuit and this lowers the capacitance variation to 1.16 so that the oscillator for band I can be tuned between 101 and 87 MHz. The inductance L 1 is designed for volume III and L 1 + L 2 for volume I in a known manner. As can be easily seen from FIG. 1, in band I operation the resonance resistance of the circuit is suppressed by the capacitor C 4 , which can also be seen from the following equation:
Die in F i g. 2 gezeigte erfindungsgemäße Schaltung unterscheidet sich von der in Fig. 1 gezeigten dadurch, daß der Kondensator C3 durch den Kondensator C5 und die mit diesem in Reihe geschaltete Induktivität L3 ersetzt ist und daß der Kondensator C4 wegfällt. Erfindungsgemäß ist der Verkürzungskondensator C5 so ausgelegt, daß er in Band I die erforderliche Frequenzvariation erzeugt. In diesem Frequenzbereich ist die Induktivität L3 praktisch unwirksam. Sie besteht beispielsweise aus nur zwei Windungen eines Drahtes. Geringe Änderungen der Induktivität der Spule L3 haben hierbei praktisch keinen Einfluß auf die Oszillatorfrequenz. Im Band III hingegen ist die Induktivität der Spule L3 so hoch, daß die Schwingkreiskapazität derart erhöht erscheint, daß die Frequenzvariation im Band III den erforderlichen Wert von 1,24 aufweist.The in F i g. The circuit according to the invention shown in FIG. 2 differs from that shown in FIG. 1 in that the capacitor C 3 is replaced by the capacitor C 5 and the inductance L 3 connected in series with it and that the capacitor C 4 is omitted. According to the invention, the shortening capacitor C 5 is designed so that it generates the required frequency variation in band I. In this frequency range, the inductance L 3 is practically ineffective. It consists, for example, of only two turns of a wire. Small changes in the inductance of the coil L 3 have practically no influence on the oscillator frequency. In band III, on the other hand, the inductance of coil L 3 is so high that the resonant circuit capacitance appears to be increased to such an extent that the frequency variation in band III has the required value of 1.24.
Der Kondensator C5 ist so groß zu wählen, daß er den Wert der in Reihe geschalteten Kondensatoren C3 und C4 der Fig. 1 entspricht, also:The capacitor C 5 is to be selected so large that it corresponds to the value of the capacitors C 3 and C 4 connected in series in FIG. 1, that is:
^ C3-C4 ^ C 3 -C 4
Die Induktivität L3 ist so zu bemessen, daß im Band-III-Betrieb die Verkürzungskapazität dem Wert des Kondensators C3 der Fig. 1 entspricht, d.h., es muß sein:The inductance L 3 is to be dimensioned so that in band III operation the shortening capacitance corresponds to the value of the capacitor C 3 in FIG. 1, ie it must be:
^ 1 2 T Γ ^ 1 2 T Γ
I — CO Jb3 C5 I - CO Jb 3 C 5
Die Erfindung ist besonders vorteilhaft anwendbar bei zwei Frequenzbereichen, bei denen eine unterschiedliche Frequenzvariation vorhanden ist. Sie ist jedoch auch verwendbar für mehrere Frequenzbereiche, wobei in an sich bekannter Weise die Induktivitäten durch Umschaltung vergrößert bzw. verkleinert werden, und zusätzlich wird erfindungsgemäß die Spule L3 so dimensioniert, daß sie durch Zu- oder Abschaltung von Induktivitätsteilen in mehreren Frequenzbereichen wirksam bzw. unwirksam wird. Hierdurch ist zwar für die Spule L3 ein besonderer Schalter erforderlich, jedoch wird durch diese Spule der Vorteil des Gleichlaufabgleichs in den einzelnen Bändern weiterhin erreicht, und auch die Drosselspulen bei Verwendung von Schalterdioden sind zur überbrückung des Kondensators C4 der bekannten Schaltungen nicht erforderlich.The invention can be used particularly advantageously in two frequency ranges in which there is a different frequency variation. However, it can also be used for several frequency ranges, the inductances being increased or decreased in a known manner by switching, and additionally the coil L 3 is dimensioned according to the invention so that it becomes effective or effective in several frequency ranges by connecting or disconnecting inductance parts . becomes ineffective. Although this requires a special switch for the coil L 3 , this coil still has the advantage of synchronism adjustment in the individual bands, and the choke coils when using switch diodes are not required to bypass the capacitor C 4 of the known circuits.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET0035466 | 1967-12-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE1591764A1 DE1591764A1 (en) | 1970-09-10 |
DE1591764B2 true DE1591764B2 (en) | 1972-02-17 |
Family
ID=7559218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19671591764 Withdrawn DE1591764B2 (en) | 1967-12-13 | 1967-12-13 | OSCILLATOR CIRCUIT WITH A CAPACITIVELY TUNED PARALLEL RESONANCE CIRCUIT |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1591764B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2847272A1 (en) * | 1978-10-31 | 1980-05-08 | Licentia Gmbh | Oscillator for VHF TV receiver - has RL circuit ensuring synchronism between oscillator and receive frequency over entire tuning range |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2558120C3 (en) * | 1975-12-23 | 1981-09-17 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Transistor oscillator |
-
1967
- 1967-12-13 DE DE19671591764 patent/DE1591764B2/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2847272A1 (en) * | 1978-10-31 | 1980-05-08 | Licentia Gmbh | Oscillator for VHF TV receiver - has RL circuit ensuring synchronism between oscillator and receive frequency over entire tuning range |
Also Published As
Publication number | Publication date |
---|---|
DE1591764A1 (en) | 1970-09-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E771 | Valid patent as to the heymanns-index 1977, willingness to grant licences | ||
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 |