WO1991016761A1 - Circuit de frequence radio actif a large bande - Google Patents

Circuit de frequence radio actif a large bande Download PDF

Info

Publication number
WO1991016761A1
WO1991016761A1 PCT/FI1991/000117 FI9100117W WO9116761A1 WO 1991016761 A1 WO1991016761 A1 WO 1991016761A1 FI 9100117 W FI9100117 W FI 9100117W WO 9116761 A1 WO9116761 A1 WO 9116761A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
wide
changed
transistor
band
Prior art date
Application number
PCT/FI1991/000117
Other languages
English (en)
Inventor
Juha Nikkanen
Original Assignee
Teleste Antenni Oy
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 Teleste Antenni Oy filed Critical Teleste Antenni Oy
Publication of WO1991016761A1 publication Critical patent/WO1991016761A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/083—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements in transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/191—Tuned amplifiers

Definitions

  • the present invention relates to a wide-band active radio frequency circuit, the amplification of which is controllable.
  • the networks also require amplifications of different magnitudes and thus conventionally several transistor stages and/or faders are connected in succession.
  • the change of amplification is effected by connecting e.g. circuits which shunt the transistor stages, wherein, however, the mechanical couplings arranged in the signal path are unreliable and may cause interference.
  • Using relays is undesirable since they are less reliable at high frequencies because of the mechanical parts they comprise and because fitting them into electronic solutions causes problems.
  • amplification can be changed by connecting adjustable amplifiers to the circuit, but the problem with this type of transistor stage is a varying impedance level, which must be compensated for by arranging matching circuits on the input and output sides of the transistor stage.
  • the aim of the invention is, therefore, to achieve a simple and reliable circuit which can advantageously be used in a cable television network.
  • This aim is achieved by means of the invention in such a way that the circuit's operating voltage is supplied through coupling elements, by means of which the polarity of the circuit's operating voltage can be changed if desired, in accordance with which the active element of the circuit operates either as an amplifier or as a voltage follower without the input or output poles changing .
  • the circuit relating to the invention has a simple and reliable structure, as a single transistor stage is advantageously used and can be controlled to be either an amplifier or a voltage follower. Thanks to this solution, no separate circuits shunting the amplifier or amplifiers connected in series are needed.
  • the transistor stage Tl shown in the figure is used as a dual-purpose stage, on the one hand as a wide-band amplifier stage and on the other as a voltage follower.
  • the function is selected on the coupling's simultaneously functioning keys SI - S4, by means of which the polarity of the circuit's operating voltage is changed.
  • the couplings can be realized in other ways, too, known to a person skilled in the art, e.g. by means of semiconductor couplings. In both functions the factors affecting the quality of the RF-signal, such as the distortion properties and the noise performance as well as the impedance level remain essentially the same. In the voltage follower function the transducer loss is as small as possible.
  • the keys SI - S4 of the coupling element are in position 1.
  • the NPN-transistor stage functions as an ordinary feedback common-emitter stage.
  • the amplification is determined by the feedback elements LC and RC,.when the PIN-diode pair D1-D2 is made conductive by forward direct current +12 V on key S4.
  • the circuit's capacitances and inductances have, in accordance with the practice in the field, an RF-signal path from input RF IN to output RF OUT, which is separated from the transistor's direct current circuits.
  • the voltage follower function when the coupling's keys are in position 2, the direction of the collector current of transistor Tl is reversed, that is, from emitter to collector.
  • the value of the collector current is limited by means of the resistance 1.5 kohm, connected through key S3, to about 20mA.
  • the PIN-diodes in the emitter circuit are then in a blocked state and no direct current flows through the circuit, and thus they create a sufficiently high impedance from the emitter to the ground.
  • This voltage follower functions in a different way than the conventional solution, and thus in the present solution the collector current RF OUT follows the base voltage RF IN.
  • the circuit relating to the invention can advantageously be used in a cable television network. Tests carried out with the circuit have shown the circuit to function in accordance with the targets set for it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

La présente invention se rapporte à un circuit de fréquence radio (HF) à large bande qui se caractérise par le fait que la tension de service du circuit est fournie à travers des éléments de couplage (S1-S4) par l'intermédiaire desquels la polarité du circuit peut être changée s'il est souhaité, de sorte que l'étage à transistor (T1) fonctionne soit comme un amplificateur ou comme un suiveur de tension sans que les pôles d'entrée ou de sortie (ENTREE HF, SORTIE HF) du signal-HF ne soient changés.
PCT/FI1991/000117 1990-04-25 1991-04-18 Circuit de frequence radio actif a large bande WO1991016761A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI902063A FI87029C (fi) 1990-04-25 1990-04-25 Bredbandig aktiv rf-krets
FI902063 1990-04-25

Publications (1)

Publication Number Publication Date
WO1991016761A1 true WO1991016761A1 (fr) 1991-10-31

Family

ID=8530330

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000117 WO1991016761A1 (fr) 1990-04-25 1991-04-18 Circuit de frequence radio actif a large bande

Country Status (2)

Country Link
FI (1) FI87029C (fr)
WO (1) WO1991016761A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241284A (en) * 1990-02-16 1993-08-31 Nokia Mobile Phones Ltd. Circuit arrangement for connecting RF amplifier and supply voltage filter
WO1993021703A1 (fr) * 1992-04-15 1993-10-28 Coachline Video Express Pty Ltd Systeme de distribution de signaux

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368528A2 (fr) * 1988-11-09 1990-05-16 STMicroelectronics S.r.l. Amplificateur audio avec états d'attente et muets

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368528A2 (fr) * 1988-11-09 1990-05-16 STMicroelectronics S.r.l. Amplificateur audio avec états d'attente et muets

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 341, E554; & JP,A,62 122 306, MITSUBISHI ELECTRIC CORP, 03-06-1987. *
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 376, E563; & JP,A,62 143 511, 26-06-1987, HITACHI LTD, see "purpose". *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 277, E285; & JP,A,59 147 514, ROOMU K.K., 23-08-1984. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241284A (en) * 1990-02-16 1993-08-31 Nokia Mobile Phones Ltd. Circuit arrangement for connecting RF amplifier and supply voltage filter
WO1993021703A1 (fr) * 1992-04-15 1993-10-28 Coachline Video Express Pty Ltd Systeme de distribution de signaux

Also Published As

Publication number Publication date
FI87029C (fi) 1992-11-10
FI902063A0 (fi) 1990-04-25
FI902063A (fi) 1991-10-26
FI87029B (fi) 1992-07-31

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