FR2612017A1 - Oscillator with tuned circuit adjustable within a wide frequency range - Google Patents
Oscillator with tuned circuit adjustable within a wide frequency range Download PDFInfo
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- FR2612017A1 FR2612017A1 FR8702848A FR8702848A FR2612017A1 FR 2612017 A1 FR2612017 A1 FR 2612017A1 FR 8702848 A FR8702848 A FR 8702848A FR 8702848 A FR8702848 A FR 8702848A FR 2612017 A1 FR2612017 A1 FR 2612017A1
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- inductance
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- frequency
- oscillator according
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Classifications
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- 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
- H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
- H03B5/1841—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator
-
- 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
- H03B5/1243—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 the means comprising voltage variable capacitance diodes
-
- 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
- H03B5/1256—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 variable inductance
-
- 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
- H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
- H03B2200/003—Circuit elements of oscillators
- H03B2200/0056—Circuit elements of oscillators including a diode used for switching
-
- 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
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode
-
- 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
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/025—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements
- H03B2201/0258—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements the means comprising a diode
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
Description
La présente invention concerne les oscillateurs a' accordé, susceptibles d'être réglés dans une large gamme de fréquence.The present invention relates to tuned oscillators, capable of being adjusted over a wide frequency range.
On connaît déjà de nombreuses réalisations d'osci1lateurs dans lesquelles un circuit résonnant, constitué d'une inductance et d'une capacité, définit, à l'accord, la fréquence du signal émis par lesdits oscillateurs. Pour faire varier cette fréquence, il est usuel de modifier la valeur de ladite capacité, soit manuellement, soit électriquement. Dans ce dernier cas, on prévoit par exemple une diode à capacité variable commandée par une tension continue réglable. Ainsi, en modifiant la valeur de la capacité, on modifie celle de la fréquence de résonance propre du circuit résonnant LO et donc la fréquence du signal émis par l'oscillateur.Numerous embodiments of oscillators are already known in which a resonant circuit, consisting of an inductor and a capacitor, defines, in agreement, the frequency of the signal emitted by said oscillators. To vary this frequency, it is customary to modify the value of said capacity, either manually or electrically. In the latter case, a variable capacity diode controlled by an adjustable DC voltage is provided, for example. Thus, by modifying the value of the capacitance, that of the natural resonant frequency of the resonant circuit LO and therefore the frequency of the signal emitted by the oscillator is modified.
Toutefois, une telle méthode de réglage de la fréquence des oscillateurs à circuit accordé présente des limites. D'une part, par simple réglage de la capacité du circuit résonnant, il est difficile, sinon impossible, d'obtenir pour l'oscillateur une large gamme de fréquence, s'étendant par exemple sur plusieurs centaines de MHz. D'autre part, même si grâce à un montage complexe on réussissait à obtenir par variation de capacité une large gamme théoricue de fréquence pour ledit oscillateur, le passage d'une fréquence à une autre, éloignée, serait long et rendrait ledit oscillateur pratiquement inutilisable.However, such a method of adjusting the frequency of tuned-circuit oscillators has limits. On the one hand, by simple adjustment of the capacity of the resonant circuit, it is difficult, if not impossible, to obtain for the oscillator a wide frequency range, extending for example over several hundred MHz. In addition, even if thanks to a complex assembly one succeeded in obtaining by variation of capacity a broad theoretical range of frequency for said oscillator, the passage from one frequency to another, distant, would be long and would make said oscillator practically unusable .
La présente invention a pour objet de remédier à ces inconvénients. Elle concerne un oscillateur à circuit résonnant pouvant être utilisé pour une large gamme de fréquence (plusieurs centaines de MHz) et susceptible de sauter rapidement d'une fréquence à l'autre de ladite gamme, même lorsque lesdites fréquences sont très éloignées l'une de l'autre à l'intérieur de cette gnne. The object of the present invention is to remedy these drawbacks. It relates to a resonant circuit oscillator which can be used for a wide frequency range (several hundred MHz) and capable of jumping rapidly from one frequency to another in said range, even when said frequencies are very far from each other. the other inside this genus.
A cette fin, selon l'invention, 1' oscillateur comportant un circuit résonnant à inductance et capacité, est remarquable en ce que, à ladite inductance, sont associés des circuits de dérivation pourvus chacun d'un interrupteur commandé et répartis le long de ladite inductance, de façon à permettre de modifier le coefficient d'induction de ladite inductance.To this end, according to the invention, the oscillator comprising a resonant circuit with inductance and capacitance, is remarkable in that, with said inductance, are associated bypass circuits each provided with a controlled switch and distributed along said inductance, so as to modify the induction coefficient of said inductance.
Ainsi, pour commande sélective desdits interrupteurs commandés, on met en circuit une longueur déterminée de ladite inductance, de sorte que l'on choisit une valeur particulière pour cette inductance et donc une valeur particulière pour la fréquence du signal délivré par ledit oscillateur.Thus, for selective control of said controlled switches, a determined length of said inductance is put into circuit, so that a particular value is chosen for this inductance and therefore a particular value for the frequency of the signal delivered by said oscillator.
Grâce auxdits circuits de dérivation, on peut donc subdiviser la gamme de fréquence totale dudit oscillateur en une pluralité de sous-gammes, dont chacune d'elles correspond à un circuit de dérivation particulier. Ainsi, il est possible de passer rapidement d'une sous-gamme à une autre, par simple commutation d'interrupteurs commandés. De préférence, afin d'éviter des trous de fréquence entre les sous-gammes (reproductibilité, dérives climatiques, etc...), deux sous-gammes adjacentes se chevauchent de manière que les fréquences supérieures de la sous-gamme inférieure correspondent aux fréquences inférieures de la sous-gamme supérieure.Thanks to said branch circuits, it is therefore possible to subdivide the total frequency range of said oscillator into a plurality of sub-ranges, each of which corresponds to a particular branch circuit. Thus, it is possible to quickly switch from one sub-range to another, by simply switching controlled switches. Preferably, in order to avoid frequency gaps between the sub-ranges (reproducibility, climatic drifts, etc.), two adjacent sub-ranges overlap so that the upper frequencies of the lower sub-range correspond to the frequencies lower sub-range.
De façon connue, la capacité dudit circuit résonnant est avantageusement variable. Dans ce cas, on voit ainsi que, par commande sélective des circuits de dérivation, on peut obtenir un réglage grossier de fréquence par choix d'une sous-gamme et que, par commande de ladite capacité, on peut obtenir un réglage fin de fréquence à l'intérieur d'une sous-gamme. In known manner, the capacity of said resonant circuit is advantageously variable. In this case, it can thus be seen that, by selective control of the branch circuits, it is possible to obtain a rough frequency adjustment by choosing a sub-range and that, by controlling said capacity, it is possible to obtain a fine frequency adjustment. within a subrange.
De préférence, à cause de leurs excellentes caractéristi- ques de coupure et d'isolation pour les fréquences élevées (gammes VHF et UHF), lesdits interrupteurs commances sont des diodes de type PIN.Preferably, because of their excellent cut-off and isolation characteristics for high frequencies (VHF and UHF ranges), said controlled switches are PIN type diodes.
Il est avantageux que ladite inductance se présente sous la forme d'une spirale plane. Elle peut par exemple être réalisée par gravure d'une couche métallique épaisse (de l'ordre de 0,2 mm) sur une plaquette de matériau isolant.It is advantageous that said inductance is in the form of a planar spiral. It can for example be produced by etching a thick metallic layer (of the order of 0.2 mm) on a wafer of insulating material.
Dans ce cas, il peut être avantageux de réaliser, totalement ou en partie, ledit oscillateur sous la forme d'un circuit hybride à couche épaisse.In this case, it may be advantageous to produce, in whole or in part, said oscillator in the form of a thick-film hybrid circuit.
Dans la description schématique donnée ci-dessus du fonctionnement de l'oscillateur conforme à l'invention, on a expliqué, par analogie à ce qui se passerait en basse fréquence, que les circuits de dérivation modifiaient la longueur en circuit de l'inductance. En réalité, en fonctionnement à haute et très haute fréquence, les capacités réparties qui-apparaIssent empechent de considérer que la conduction d'un circuit de dérivation entrain e la mise hors circuit totale de la partie de cette inductance disposée en aval dudit circuit de dérivation. Il se produit seulement alors une modification du coefficient d'induction de l'inductance.In the schematic description given above of the operation of the oscillator according to the invention, it has been explained, by analogy to what would happen at low frequency, that the branch circuits modify the length in circuit of the inductance. In reality, in high and very high frequency operation, the distributed capacities which appear prevent it from considering that the conduction of a bypass circuit leads to the complete deactivation of the part of this inductance disposed downstream of said bypass circuit. . Only then does a change in the induction coefficient of the inductance occur.
Ce phénomène en haute et très haute fréquence peut d'ailleurs être mis à profit. En effet, au lieu de ne rendre conducteur qu'un seul circuit de dérivation à la fois, on peut rendre simultanément conducteurs deux ou plusieurs circuits de dérivation. On peut ainsi modifier légèrement la gamme de fréquence et augmenter le niveau du signal de sortie On a remarque que ce mode de fonctionnement était particulièrement intéressant pour lineariser le niveau de sortie de l'oscillateur selon l'invention au-de# de 450 z. Dans ce cas, la conduction simuitanée de deux circuits de dérivation se traduit par une augmentatior d'environ 20 % du courant d'alimentation de l'oscillateur, par rapport au cas où un seul circuit de dérivation est rendu conducteur.This phenomenon in high and very high frequency can also be taken advantage of. Indeed, instead of making only one branch circuit conductive at a time, two or more branch circuits can be made conductive simultaneously. It is thus possible to slightly modify the frequency range and to increase the level of the output signal. It has been noted that this operating mode was particularly advantageous for linearizing the output level of the oscillator according to the invention above # of 450 z. In this case, the simultaneous conduction of two branch circuits results in an increase of about 20% in the supply current of the oscillator, compared to the case where only one branch circuit is made conductive.
Les figures du dessin annexé feront bien comprendre comment l'invention peut être réalisée. Sur ces figures, des références identiques désignent des éléments semblables.The figures of the appended drawing will make it clear how the invention can be implemented. In these figures, identical references designate similar elements.
La figure 1 donne le schéma synoptique d'un exemple de réalisation de l'oscillateur conforme à la présente invention.Figure 1 gives the block diagram of an exemplary embodiment of the oscillator according to the present invention.
La figure 2 illustre le fonctionnement dudit oscillateur.Figure 2 illustrates the operation of said oscillator.
La figure 3 montre, en vue agrandie, un mode de réalisation en circuit hybride d'une partie de ltoscillateur de la figure 1.FIG. 3 shows, in enlarged view, an embodiment in a hybrid circuit of a part of the oscillator of FIG. 1.
L'oscillateur, conforme à la présente invention et représenté sur la figure 1, est du type dit VCO, ctest-à- dire dont la fréquence de sortie est commandée par une tension réglable de commande. Il comporte essentiellement un circuit résonnant LC, constitué d'une inductance L portant la référence 1 et d'une capacité C portant la référence 2, ainsi qu'un dispositif électronique de commande 3, comportant par exemple un synthétiseur de fréquence.The oscillator, according to the present invention and shown in FIG. 1, is of the so-called VCO type, that is to say the output frequency of which is controlled by an adjustable control voltage. It essentially comprises a resonant circuit LC, consisting of an inductance L carrying the reference 1 and of a capacitor C carrying the reference 2, as well as an electronic control device 3, comprising for example a frequency synthesizer.
De façon connue, la capacité 2 est constituée d'une diode 4 à capacité variable (appelée généralement varicap), recevant ladite tension réglable de commande du dispositif 3, qui émet une telle tension à sa sortie 5 et l'adresse a ladite diode par l'intermédiaire de composants de liaison 6,7 et 8.Par ailleurs, à sa sortie 9, le dispositif électronique de commande 3 émet un signal de pllotage, qui est appliqué au pcint 10 commun à l'inductance 1 et à a capacité variable 2, par l'intermédiaire d'un condensateur de liaison il. L extrémité opposée de ladite inductance I est reliée à la masse par l'intermédiaire d'un condensave- >
12. L'inductance 1 et la capacité variable 2 sont montées en parallèle l'une sur l'autre, entre ledit point commun 10 et la masse.In a known manner, the capacitor 2 consists of a diode 4 with variable capacitance (generally called varicap), receiving said adjustable control voltage of the device 3, which emits such a voltage at its output 5 and addresses it to said diode by via connection components 6,7 and 8. Furthermore, at its output 9, the electronic control device 3 emits a plotting signal, which is applied to the pcint 10 common to inductance 1 and with variable capacity 2, via a connecting capacitor there. The opposite end of said inductor I is connected to ground via a condensave->
12. The inductor 1 and the variable capacitor 2 are mounted in parallel with each other, between said common point 10 and the ground.
Dans le mode de réalisation représenté sur la figure 1, l'inductance 1 est formée par une spirale dont l'extrémité extérieure constitue le point commun 10 et dont l'extrémité
Intérieure 13 est reliée à la masse par le condensateur 12.In the embodiment shown in FIG. 1, the inductor 1 is formed by a spiral whose external end constitutes the common point 10 and whose end
Inner 13 is connected to ground by capacitor 12.
Conformement à l'invention, en différents points 14 à 21, l'inductance 1 est reliée à la masse par une diode de type
PIN et un condensateur. Ces diodes PIN: portent respectivement les références 22 à 29, et lesdits condensateurs sont désignes par les références respectives 30 à 37.In accordance with the invention, at different points 14 to 21, the inductor 1 is connected to ground by a diode of the type
PIN and a capacitor. These PIN diodes: bear the references 22 to 29 respectively, and the said capacitors are designated by the respective references 30 to 37.
Le point commun à chacune des diodes PIN 22 à 29 et au condensateur correspondant 3G à 37 est relié,- par une résistance associée 38 à 45, à une sortie respective 46 à 53 du dispositif de commande électronique 3. Celui-ci est susceptible c remettre sur chacune de ses sorties 46 à 53 un courant de polarisation pour la diode PIN correspondante, tel que celle-ci devienne conductrice.The point common to each of the PIN diodes 22 to 29 and to the corresponding capacitor 3G to 37 is connected, - by an associated resistor 38 to 45, to a respective output 46 to 53 of the electronic control device 3. This is likely c reset on each of its outputs 46 to 53 a bias current for the corresponding PIN diode, such that it becomes conductive.
On voit ainsi qu'en rendant conductrice l'une ou l'autre desdites ou plusieurs diodes PIN 22 à 29, on modifie la longueur de l'inductance 1 en circuit et donc la valeur de cette inductance.It is thus seen that by making one or the other of said or more PIN diodes 22 to 29 conductive, the length of the inductor 1 in circuit is modified and therefore the value of this inductor.
La commande de la conduction desdites diodes permet donc d'agir sur la fréquence du circuit LC et donc sur celle de l'oscillateur. The control of the conduction of said diodes therefore makes it possible to act on the frequency of the LC circuit and therefore on that of the oscillator.
La répartition des points de dérivation 14 à 21 le long de l'inductance 1 est déterminée de façon que la gamme oe fréquence totale de l'oscillation soit subdivisée en autant de sous-gammes gi qu'il existe de circuits de dérivation 14,22,30,.. .21,29,37. Sur la figure 2, qui illustre schématiquement la puissance émise P en fonction de la fréquence F, on a représenté deux de ces sous-gammes de fréquence gi et gj, qui se trouvent en position adjacente.The distribution of the branch points 14 to 21 along the inductance 1 is determined so that the total frequency range of the oscillation is subdivided into as many sub-ranges gi as there are branch circuits 14,22 , 30, ... 21,29,37. In FIG. 2, which diagrammatically illustrates the transmitted power P as a function of the frequency F, two of these frequency sub-ranges gi and gj are shown, which are in adjacent position.
Comme on peut le voir, ces deux sous-gammes adjacentes gi et gj se chevauchent, de sorte qu'elles comportent en commun les fréquences se trouvant dans la zone hachurée 54.As can be seen, these two adjacent sub-ranges gi and gj overlap, so that they have in common the frequencies located in the hatched area 54.
On obtient ainsi la continuité de fréquence à l'intérieur de la gamme totale. Frequency continuity is thus obtained within the total range.
Sur la figure 3, on a représenté une partie de l'oscillateur de la figure 1 réalisée sous la forme d'un circuit hybride en couche épaisse réalisée sur une plaquette isolante 55.In FIG. 3, a part of the oscillator in FIG. 1 is shown, produced in the form of a thick-film hybrid circuit produced on an insulating plate 55.
Dans une couche métallique épaisse (0,2 mm) déposée sur cette plaquette isolante 55, on a gravé la spirale 1, ainsi que différentes plages (hachurées) destinées à la liaison électrique entre les différents composants 4,6,7,8,11,12,22 à 45, déposés sur ladite plaquette. Les liaisons entre les points 10,13 et 14 à 21 de la spirale 1 et les composants 4,12 et 22 à 29 correspondants sont représentées comme étant réalisées par des fils soudés à leurs extrémités. In a thick metallic layer (0.2 mm) deposited on this insulating plate 55, the spiral 1 has been etched, as well as different areas (hatched) intended for the electrical connection between the different components 4,6,7,8,11 , 12.22 to 45, deposited on said plate. The connections between points 10, 13 and 14 to 21 of the spiral 1 and the corresponding components 4, 12 and 22 to 29 are shown as being produced by wires welded at their ends.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8702848A FR2612017A1 (en) | 1987-03-03 | 1987-03-03 | Oscillator with tuned circuit adjustable within a wide frequency range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8702848A FR2612017A1 (en) | 1987-03-03 | 1987-03-03 | Oscillator with tuned circuit adjustable within a wide frequency range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2612017A1 true FR2612017A1 (en) | 1988-09-09 |
Family
ID=9348537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8702848A Pending FR2612017A1 (en) | 1987-03-03 | 1987-03-03 | Oscillator with tuned circuit adjustable within a wide frequency range |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2612017A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0734089A1 (en) * | 1995-03-22 | 1996-09-25 | Lk-Products Oy | Filter |
| WO1997037432A1 (en) * | 1996-04-02 | 1997-10-09 | Philips Electronics N.V. | Portable radio comprising a connectable circuit |
| EP0945980A1 (en) * | 1998-03-24 | 1999-09-29 | Sony International (Europe) GmbH | Band switchable tuning circuit |
| WO2001006638A1 (en) * | 1999-07-19 | 2001-01-25 | Cambridge Silicon Radio Ltd. | Variable oscillator |
| US6218909B1 (en) * | 1998-10-23 | 2001-04-17 | Texas Insturments Israel Ltd. | Multiple frequency band voltage controlled oscillator |
| WO2004010571A1 (en) * | 2002-07-18 | 2004-01-29 | Qualcomm, Incorporated | Wideband vco resonant circuit method and apparatus |
| WO2006023049A1 (en) * | 2004-08-20 | 2006-03-02 | Xceive Corporation | Television receiver including an integrated band selection filter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3289123A (en) * | 1964-02-01 | 1966-11-29 | Telefunken Patentverwertungese | Tank circuit with band selection switch and capacitive tuning means |
| CH460093A (en) * | 1966-12-23 | 1968-07-31 | Ibm | Circuit arrangement for generating an audio frequency signal of a certain, predetermined frequency or frequency combination |
| FR2276749A1 (en) * | 1974-06-26 | 1976-01-23 | Videon | UHF tuning for television receiver - permits multi standard working with single oscillator and tuned 1/4 wave line |
| US4002986A (en) * | 1975-03-27 | 1977-01-11 | Zenith Radio Corporation | Television receiver with tuner capable of receiving air and CATV signals |
| US4598423A (en) * | 1985-02-28 | 1986-07-01 | Rca Corporation | Tuning circuit for a multiband tuner |
-
1987
- 1987-03-03 FR FR8702848A patent/FR2612017A1/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3289123A (en) * | 1964-02-01 | 1966-11-29 | Telefunken Patentverwertungese | Tank circuit with band selection switch and capacitive tuning means |
| CH460093A (en) * | 1966-12-23 | 1968-07-31 | Ibm | Circuit arrangement for generating an audio frequency signal of a certain, predetermined frequency or frequency combination |
| FR2276749A1 (en) * | 1974-06-26 | 1976-01-23 | Videon | UHF tuning for television receiver - permits multi standard working with single oscillator and tuned 1/4 wave line |
| US4002986A (en) * | 1975-03-27 | 1977-01-11 | Zenith Radio Corporation | Television receiver with tuner capable of receiving air and CATV signals |
| US4598423A (en) * | 1985-02-28 | 1986-07-01 | Rca Corporation | Tuning circuit for a multiband tuner |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0734089A1 (en) * | 1995-03-22 | 1996-09-25 | Lk-Products Oy | Filter |
| US5734305A (en) * | 1995-03-22 | 1998-03-31 | Lk-Products Oy | Stepwise switched filter |
| WO1997037432A1 (en) * | 1996-04-02 | 1997-10-09 | Philips Electronics N.V. | Portable radio comprising a connectable circuit |
| US5936474A (en) * | 1996-04-02 | 1999-08-10 | U.S. Philips Corporation | Oscillator having correction element switchable by a fuse |
| EP0945980A1 (en) * | 1998-03-24 | 1999-09-29 | Sony International (Europe) GmbH | Band switchable tuning circuit |
| US6218909B1 (en) * | 1998-10-23 | 2001-04-17 | Texas Insturments Israel Ltd. | Multiple frequency band voltage controlled oscillator |
| WO2001006638A1 (en) * | 1999-07-19 | 2001-01-25 | Cambridge Silicon Radio Ltd. | Variable oscillator |
| US6968168B1 (en) | 1999-07-19 | 2005-11-22 | Cambridge Silicon Radio Ltd. | Variable oscillator |
| WO2004010571A1 (en) * | 2002-07-18 | 2004-01-29 | Qualcomm, Incorporated | Wideband vco resonant circuit method and apparatus |
| US6801097B2 (en) | 2002-07-18 | 2004-10-05 | Qualcomm Incorporated | Wideband VCO resonant circuit method and apparatus |
| WO2006023049A1 (en) * | 2004-08-20 | 2006-03-02 | Xceive Corporation | Television receiver including an integrated band selection filter |
| US7251466B2 (en) | 2004-08-20 | 2007-07-31 | Xceive Corporation | Television receiver including an integrated band selection filter |
| CN1973437B (en) * | 2004-08-20 | 2010-10-13 | 瑞科信公司 | Television receiver including an integrated band selection filter |
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