WO1992005631A1 - Procede et montage de commande automatique du gain d'un amplificateur de puissance haute frequence - Google Patents

Procede et montage de commande automatique du gain d'un amplificateur de puissance haute frequence Download PDF

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Publication number
WO1992005631A1
WO1992005631A1 PCT/FI1991/000292 FI9100292W WO9205631A1 WO 1992005631 A1 WO1992005631 A1 WO 1992005631A1 FI 9100292 W FI9100292 W FI 9100292W WO 9205631 A1 WO9205631 A1 WO 9205631A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio
amplifier
signal
frequency
arrangement
Prior art date
Application number
PCT/FI1991/000292
Other languages
English (en)
Inventor
Arto JÄNTTI
Original Assignee
Telenokia 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 Telenokia Oy filed Critical Telenokia Oy
Publication of WO1992005631A1 publication Critical patent/WO1992005631A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers

Definitions

  • the invention relates to a method and an arrangement for automatic gain control of a radio- frequency power amplifier.
  • transmission-frequency signals from a modulator are usually amplified by a separate wide-band radio-frequency power amplifier before the signal is applied to an antenna.
  • the object of the invention is to provide gain control for a radio-frequency power amplifier, by means of which the magnitude of the output signal of even a non-linear amplifier can be adjusted to a desired level without a long control loop. This is achieved by means of a method according to the invention for the automatic gain ' control of a radio-frequency power amplifier, which method is characterized in that the gain of the amplifier is adjusted by a control signal obtained by comparing samples taken from the input and output signals of the amplifier.
  • the invention is also concerned with an arrangement for automatic gain control of a radio-fr ⁇ equency power amplifier, the arrangement comprising a first sampling means for generating a sample signal from the input signal of the radio-frequency amplifier; a second sampling means for generating a sample signal from the output signal of the radio-frequency amplifier; and means for comparing the sample signals with each other and for generating a control signal adjusting the gain of the radio-frequency amplifier on the basis of the comparison.
  • the invention is based on the idea that the gain of the amplifier is monitored and adjusted con ⁇ tinuously on the basis of sample signals taken from the input and output signals of the amplifier in such a way that the ratio between the input and output levels of the amplifier, i.e. the gain of the amplifier, is maintained constant.
  • the sampling of the input and output signals of the amplifier is preferably carried out by microstrip directional couplers or other similar means based on capacitive and/or inductive sampling, thus avoiding traditional measurement of gain by means of a series resistor measuring the collector current of the power transistor of the amplifier.
  • the preferred embodiment of the invention shown in the figure comprises a radio-frequency amplifier 1, preferably a non-linear radio-frequency power amplifier biased to operate in class AB, for instance.
  • the amplifier 1 comprises a radio-frequency signal input 10 to which a radio-frequency input signal RF IN to be amplified is applied e.g. from the transmitter itself when the amplifier 1 is a separate power amplifier, and a radio-frequency signal output 15 at which an amplified radio-frequency output signal RF OUT to be applied to a transmitting antenna is present.
  • the signal input 10 of the amplifier 1 comprises a microstrip directional coupler 2 which generates a sample signal 11 proportional to the magnitude or level of the incoming signal, which sample signal is detected by a detector circuit 4 and filtered by a lowpass filter 5 before it is applied to an input 13 in a comparator circuit 8.
  • the signal output 15 of the amplifier 1 com ⁇ prises a microstrip directional coupler 3 which generates from the output signal of the amplifier a sample signal 12 proportional to the magnitude or level of the output signal, and the sample signal is detected by a detector circuit 6 and filtered by a lowpass filter 7 before it is applied to another input 14 in the comparator 8.
  • the comparator 8 super- vises the gain of the amplifier 1 by comparing the sample signals present at its inputs 13 and 14 with each other and/or with one or more predetermined reference values. On the basis of the comparison the comparator circuit 8 generates a power control signal 9 to be applied to the amplifier 1 so as to adjust the collector voltage of a power transistor forming a radio-frequency amplifier, stage in the amplifier 1 in order to maintain the total gain of the amplifier at a constant value.
  • the comparator 8 may also generate an alarm signal 16 when the magnitudes of the compared sample signals change in such a way that they meet a pre ⁇ determined alarm criterion.
  • the alarm criterion may be e.g. such that the alarm signal 16 is generated when the gain determined on the basis of the sample signals decreases below a predetermined reference value.
  • the sampling means 2 and 3 are advantageous to realize by a microstrip directional coupler due to the simplicity of such couplers and the high reproducibility offered by the microstrip technology.
  • the sample signals can be easily scaled already at the sampling stage for the comparison.
  • the sampling means may be realized by any other directional coupler or other similar device effecting an inductive and/or capacitive coupling, such as a separate pick-up thread or pick-up capacitor.
  • the detecting means 4 and 6 effecting the power detection are preferably half-wave rectifiers effected by means of a diode, and the filters 5 and 7 can be realized by any suitable lowpass filtering technique.
  • the comparator circuit 8 can be realized by an operational amplifier coupled as a differential amplifier, which compares the signals present at the inputs 13 and 14 with each other, thus giving directly an output control signal proportional to the gain.

Landscapes

  • Amplifiers (AREA)

Abstract

L'invention se rapporte à un procédé et à un agencement permettant le contrôle automatique du gain d'un amplificateur de puissance haute fréquence. L'agencement de l'invention comprend un premier moyen d'échantillonnage (2) destiné à générer un signal échantillon (11) à partir du signal d'entrée de l'amplificateur haute fréquence (1); un deuxième moyen d'échantillonnage (3) destiné à générer un signal échantillon (12) à partir du signal de sortie de l'amplificateur haute fréquence (1); et un moyen (8) permettant de comparer les signaux échantillons l'un à l'autre et de générer un signal de commande (9) permettant de régler le gain de l'amplificateur haute fréquence (1) en utilisant la comparaison des signaux.
PCT/FI1991/000292 1990-09-25 1991-09-23 Procede et montage de commande automatique du gain d'un amplificateur de puissance haute frequence WO1992005631A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI904712 1990-09-25
FI904712A FI86350C (fi) 1990-09-25 1990-09-25 Foerfarande och anordning foer automatisk foerstaerkningsreglering i hoegfrekvensfoerstaerkaren.

Publications (1)

Publication Number Publication Date
WO1992005631A1 true WO1992005631A1 (fr) 1992-04-02

Family

ID=8531112

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000292 WO1992005631A1 (fr) 1990-09-25 1991-09-23 Procede et montage de commande automatique du gain d'un amplificateur de puissance haute frequence

Country Status (3)

Country Link
AU (1) AU8509391A (fr)
FI (1) FI86350C (fr)
WO (1) WO1992005631A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0632585A1 (fr) * 1993-06-30 1995-01-04 Alcatel Telspace Système de commande de la polarisation d'un amplificateur
EP0803973A1 (fr) * 1996-04-25 1997-10-29 Lucent Technologies Inc. Amplificateur de puissance linéaire à rendement optimal utilisant le contrÔle automatique de la polarisation gate/base
FR2810473A1 (fr) * 2000-06-15 2001-12-21 Sagem Dispositif de production d'un signal radioelectrique module en phase et en amplitude et procede de production d'un tel signal
WO2006043140A1 (fr) * 2004-10-22 2006-04-27 Nokia Siemens Networks Oy Procede et dispositif pour le maintien de linearite constante sur un amplificateur de puissance avec diverses conditions de charge

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2213099A (en) * 1935-12-11 1940-08-27 Rediffusion Ltd Distortion indicator for electrical amplifying systems
US3495179A (en) * 1966-06-23 1970-02-10 Hewlett Packard Co Amplifier overload indicator
US3833856A (en) * 1973-11-15 1974-09-03 Us Navy Apparatus for testing an amplifier
US4032853A (en) * 1976-10-28 1977-06-28 Hibbs Jr Eugene B Overdrive detector for radio frequency amplifier
US4048573A (en) * 1976-10-15 1977-09-13 Mcintosh Laboratory, Incorporated Amplifier improvements for limiting clipping
GB2081038A (en) * 1980-07-25 1982-02-10 Inst Francais Du Petrole Devices for amplifying and sampling multiplexed signals
EP0078130A2 (fr) * 1981-10-28 1983-05-04 Cbs Inc Correction physiologique automatique du son
EP0171843A2 (fr) * 1984-08-17 1986-02-19 Philips Electronics Uk Limited Amplificateur radiofréquence de puissance à transistors bipolaires
US4574248A (en) * 1984-05-07 1986-03-04 Rockwell International Corporation RF Power amplifier for use with VHF transceivers
WO1987004305A1 (fr) * 1985-12-30 1987-07-16 Hughes Aircraft Company Regulateur d'excitation d'un tube a ondes progressives
US4694258A (en) * 1986-03-14 1987-09-15 General Instrument Corporation Method and system of enhancing performance of feedforward amplifiers
EP0238286A2 (fr) * 1986-03-18 1987-09-23 Nec Corporation Dispositif de commande automatique de gain

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2213099A (en) * 1935-12-11 1940-08-27 Rediffusion Ltd Distortion indicator for electrical amplifying systems
US3495179A (en) * 1966-06-23 1970-02-10 Hewlett Packard Co Amplifier overload indicator
US3833856A (en) * 1973-11-15 1974-09-03 Us Navy Apparatus for testing an amplifier
US4048573A (en) * 1976-10-15 1977-09-13 Mcintosh Laboratory, Incorporated Amplifier improvements for limiting clipping
US4032853A (en) * 1976-10-28 1977-06-28 Hibbs Jr Eugene B Overdrive detector for radio frequency amplifier
GB2081038A (en) * 1980-07-25 1982-02-10 Inst Francais Du Petrole Devices for amplifying and sampling multiplexed signals
EP0078130A2 (fr) * 1981-10-28 1983-05-04 Cbs Inc Correction physiologique automatique du son
US4574248A (en) * 1984-05-07 1986-03-04 Rockwell International Corporation RF Power amplifier for use with VHF transceivers
EP0171843A2 (fr) * 1984-08-17 1986-02-19 Philips Electronics Uk Limited Amplificateur radiofréquence de puissance à transistors bipolaires
WO1987004305A1 (fr) * 1985-12-30 1987-07-16 Hughes Aircraft Company Regulateur d'excitation d'un tube a ondes progressives
US4694258A (en) * 1986-03-14 1987-09-15 General Instrument Corporation Method and system of enhancing performance of feedforward amplifiers
EP0238286A2 (fr) * 1986-03-18 1987-09-23 Nec Corporation Dispositif de commande automatique de gain

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0632585A1 (fr) * 1993-06-30 1995-01-04 Alcatel Telspace Système de commande de la polarisation d'un amplificateur
FR2708399A1 (fr) * 1993-06-30 1995-02-03 Alcatel Telspace Système de commande de la polarisation d'un amplificateur.
US5430410A (en) * 1993-06-30 1995-07-04 Alcatel N.V. Amplifier bias control system
EP0803973A1 (fr) * 1996-04-25 1997-10-29 Lucent Technologies Inc. Amplificateur de puissance linéaire à rendement optimal utilisant le contrÔle automatique de la polarisation gate/base
FR2810473A1 (fr) * 2000-06-15 2001-12-21 Sagem Dispositif de production d'un signal radioelectrique module en phase et en amplitude et procede de production d'un tel signal
WO2006043140A1 (fr) * 2004-10-22 2006-04-27 Nokia Siemens Networks Oy Procede et dispositif pour le maintien de linearite constante sur un amplificateur de puissance avec diverses conditions de charge
US7190221B2 (en) 2004-10-22 2007-03-13 Nokia Corporation Method and apparatus for maintaining constant linearity for a power amplifier over varying load conditions

Also Published As

Publication number Publication date
FI904712A (fi) 1992-03-26
FI86350B (fi) 1992-04-30
FI86350C (fi) 1992-08-10
FI904712A0 (fi) 1990-09-25
AU8509391A (en) 1992-04-15

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