DE3640969A1 - Arrangement for linearising a transmitter output stage - Google Patents

Arrangement for linearising a transmitter output stage

Info

Publication number
DE3640969A1
DE3640969A1 DE19863640969 DE3640969A DE3640969A1 DE 3640969 A1 DE3640969 A1 DE 3640969A1 DE 19863640969 DE19863640969 DE 19863640969 DE 3640969 A DE3640969 A DE 3640969A DE 3640969 A1 DE3640969 A1 DE 3640969A1
Authority
DE
Germany
Prior art keywords
signal
output stage
frequency
envelope
modulation
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Withdrawn
Application number
DE19863640969
Other languages
German (de)
Inventor
Ralf Esprester
Klaus Humann
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 Systemtechnik AG
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 DE19863640969 priority Critical patent/DE3640969A1/en
Priority to EP19870108074 priority patent/EP0248425B1/en
Priority to DE8787108074T priority patent/DE3771938D1/en
Publication of DE3640969A1 publication Critical patent/DE3640969A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • 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
    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/345—Negative-feedback-circuit arrangements with or without positive feedback using hybrid or directional couplers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/001—Digital control of analog signals

Abstract

The main patent describes an arrangement for linearising a transmitter output stage, in which the signal envelope of the RF signal driving the output stage, and the signal envelope of the output signal of the output amplifier are detected and compared in a differentiating element and from the comparison a control signal is derived for a controllable attenuator arranged in the signal path of the RF signal in front of the output stage. This arrangement is simplified by the fact that a signal processor is provided which generates from the modulation signal, taking into consideration the selected type of modulation, an envelope curve reference signal which is compared with the measured envelope of the output stage output signal in the differentiating element. When the reference signal is generated, the setting of the level of the output stage output signal to the rated power of the output stage is already taken into consideration.

Description

Die Erfindung betrifft eine Anordnung zur Linearisierung einer Senderendstufe der im Oberbegriff des Patentan­ spruchs 1 genannten Art nach Patent . . . (Patentanmeldung P 36 36 865.2).The invention relates to an arrangement for linearization a transmitter output stage in the preamble of the patent pronounced 1 type according to patent. . . (Patent application P 36 36 865.2).

Die im Hauptpatent beschriebene Anordnung ermöglicht den Aufbau eines Senders mit einer transistorisierten Gegen­ takt-Endstufe, der trotz geringer Anforderungen an die Leistungsverstärkerstufe sehr gute Intermodulationseigen­ schaften zeigt. The arrangement described in the main patent enables the Structure of a transmitter with a transistorized counter clock output stage, which despite low demands on the Power amplifier stage very good intermodulation inherent shows.  

Die Pegelregelung bei der Anordnung des Hauptpatents ist aber z. B. hinsichtlich der Zeitkonstante noch von der Betriebsart des Senders abhängig. Bei Amplitudenmodulation ist nach jedem Frequenzwechsel eine Pegeleinstellung mit Hilfe eines AO-Signals erforderlich.The level control in the arrangement of the main patent is but e.g. B. with respect to the time constant of Operating mode of the transmitter depends. With amplitude modulation is a level setting with after every frequency change AO signal required.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, den Aufwand für die Anordnung nach dem Hauptpatent zu ver­ ringern.The present invention is based on the object Ver for the arrangement according to the main patent wrestle.

Die Erfindung ist im Patentanspruch 1 beschrieben. Die Unteransprüche enthalten vorteilhafte Ausführungsformen der Erfindung.The invention is described in claim 1. The Subclaims contain advantageous embodiments the invention.

Die Pegelung der Ausgangsleistung wird bei der erfin­ dungsgemäßen Anordnung allein durch das Referenz-Hüll­ kurvensignal des Signalprozessors bestimmt. Ein AO-Signal ist zur Pegelung auf die Nennleistung des Senders nicht erforderlich. Da das Hüllkurvensignal niederfrequent ist, ist die Geschwindigkeit gebräuchlicher Prozessoren voll­ kommen ausreichend. Der Prozessor ist vorzugsweise zur Erzeugung von Hüllkurvensignalen für verschiedene Modu­ lationsarten ausgelegt. Die jeweils gewünschte Modula­ tionsart ist über einen Steuereingang festlegbar. Der bei bekannten Anordnungen gebräuchliche Senderumsetzer, bei welchem ein zwischenfrequentes Ausgangssignal mit einem stationären HF-Signal umgesetzt wird, entfällt, da die Amplitudenmodulation über das steuerbare Dämpfungsglied in der HF-Ebene erfolgt.The leveling of the output power is invented arrangement according to the invention solely through the reference envelope curve signal of the signal processor determined. An AO signal is not for leveling on the nominal power of the transmitter required. Since the envelope signal is low frequency, the speed of common processors is full come sufficiently. The processor is preferably for Generation of envelope signals for different modules types of lations. The desired module tion type can be determined via a control input. The at known arrangements common transmitter converter, at which has an intermediate frequency output signal with a stationary RF signal is implemented, because the Amplitude modulation via the controllable attenuator in the HF level.

Die Erfindung ist nachfolgend anhand der Abbildung noch veranschaulicht.The invention is based on the figure below illustrated.

Der Prozessor weist einen Steuereingang MS auf, über den eine von mehreren Modulationsarten ausgewählt sowie weitere Signalparameter, wie Frequenz, Frequenzhub o. ä. vorgegeben werden. Das modulierte Signal kann entweder als digitales Signal (z. B. Tastfunk) direkt oder als analoges Signal (z. B. Sprache) über den Analog/Digital- Wandler 26 dem Signalprozessor zugeführt werden. Dieser erzeugt aus dem modulierenden Signal unter Berücksichtigung der gewählten Modulationsart ein Hüllkurven-Referenz­ signal, das der Einhüllenden des Soll-Ausgangssignals der Endstufe proportional ist. Dieses Referenzsignal wird als Folge digitaler Werte a T dem Digital/Analog-Wandler 25 zugeführt, der an seinem Ausgang das analoge Hüllkurven- Referenzsignal auf den nicht invertierenden Eingang des im Differenzglied 7 eingesetzten Operationsverstärkers leitet. Mittels des schnell einstellbaren Dämpfungsglieds 2 wird die Amplitude des vom Synthesizer 24 abgegebenen, nicht amplitudenmodulierten RF-Signals so beeinflußt, daß die Amplitude des Ausgangssignals des Endverstärkers, die über den Richtkoppler 5 und den Hüllkurvendetektor 6 gemessen wird, ständig dem analogen Hüllkurven-Referenz­ signal proportional ist. Der konstante Proportionalitäts­ faktor ist durch die Beschaltung des Operationsverstärkers im Differenzglied 7 festgelegt. Von besonderem Vorteil ist, daß in dem Hüllkurven-Referenzsignal bereits die richtige Pegeleinstellung des Ausgangssignals auf die Nennleistung der Senderendstufe enthalten ist. The processor has a control input MS , via which one of several types of modulation is selected and further signal parameters, such as frequency, frequency deviation or the like, are specified. The modulated signal can be fed to the signal processor either as a digital signal (for example touch radio) directly or as an analog signal (for example voice) via the analog / digital converter 26 . This generates an envelope reference signal from the modulating signal, taking into account the selected type of modulation, which is proportional to the envelope of the target output signal of the output stage. This reference signal is fed as a series of digital values a T to the digital / analog converter 25 , which at its output routes the analog envelope reference signal to the non-inverting input of the operational amplifier used in the differential element 7 . By means of the quickly adjustable attenuator 2 , the amplitude of the non-amplitude-modulated RF signal output by the synthesizer 24 is influenced in such a way that the amplitude of the output signal of the power amplifier, which is measured via the directional coupler 5 and the envelope detector 6 , is constantly the analog envelope reference signal is proportional. The constant proportionality factor is determined by the circuitry of the operational amplifier in the differential element 7 . It is particularly advantageous that the envelope level reference signal already contains the correct level setting of the output signal to the nominal power of the transmitter output stage.

Der Signalprozessor gibt digitale Frequenzkommandos f T an den Synthesizer 24 ab und kann somit je nach Modulations­ art (z. B. FM) oder bei Frequenzsprungsendungen schnell die Momentanfrequenz des RF-Signals variieren.The signal processor outputs digital frequency commands f T to the synthesizer 24 and can thus vary the instantaneous frequency of the RF signal quickly depending on the type of modulation (for example FM) or in the case of frequency hopping broadcasts.

Claims (3)

1. Anordnung zur Linearisierung einer Senderendstufe, bei der eine Hochfrequenz-Signalquelle über ein steuerbares Dämpfungsglied eine transistorisierte Gegentakt-Endstufe ansteuert und bei der ein Differenzglied aus dem Hüll­ kurvensignal des von der Endstufe abgegebenen Sendesignals und einem Referenz-Hüllkurvensignal ein Differenzsignal ableitet und ein diesem Differenzsignal proportionales Steuersignal für das steuerbare Dämpfungsglied erzeugt, nach DBP . . . (deutsche Patentanmeldung P 36 36 865.2), dadurch gekennzeichnet, daß die Hochfrequenz-Signalquelle ein steuerbarer frequenzvariabler Oszillator ohne Ampli­ tudenmodulation ist, daß einem digitalen Signalprozessor das niederfrequente Modulationssignal zugeführt ist und der Signalprozessor ein Steuersignal für den frequenz­ variablen Oszillator und über einen D/A-Wandler das analoge Referenz-Hüllkurvensignal für das Differenzglied erzeugt. 1. Arrangement for the linearization of a transmitter output stage, in which a high-frequency signal source controls a transistorized push-pull output stage via a controllable attenuator and in which a differential element derives a differential signal from the envelope signal of the transmit signal emitted by the output stage and a reference envelope signal and derives a differential signal from the latter Differential signal proportional control signal generated for the controllable attenuator, according to DBP. . . (German patent application P 36 36 865.2), characterized in that the high-frequency signal source is a controllable frequency-variable oscillator without amplitude modulation, that a digital signal processor is supplied with the low-frequency modulation signal and the signal processor receives a control signal for the frequency-variable oscillator and via a D / A converter generates the analog reference envelope signal for the differential element. 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß verschiedene Modulationsarten vorgesehen sind und der Signalprozessor einen weiteren Eingang zur Festlegung der Modulationsart aufweist.2. Arrangement according to claim 1, characterized in that different types of modulation are provided and Signal processor an additional input to determine the Has modulation type. 3. Anordnung nach Ansprüchen 1 oder 2, dadurch gekenn­ zeichnet, daß der steuerbare Oszillator ein digital steuerbarer Synthesizer ist.3. Arrangement according to claims 1 or 2, characterized records that the controllable oscillator is a digital controllable synthesizer is.
DE19863640969 1986-06-06 1986-11-29 Arrangement for linearising a transmitter output stage Withdrawn DE3640969A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19863640969 DE3640969A1 (en) 1986-11-29 1986-11-29 Arrangement for linearising a transmitter output stage
EP19870108074 EP0248425B1 (en) 1986-06-06 1987-06-04 Emitter with a transistorized push-pull output stage
DE8787108074T DE3771938D1 (en) 1986-06-06 1987-06-04 TRANSMITTER ARRANGEMENT WITH A TRANSISTORIZED push-pull power amplifier.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863640969 DE3640969A1 (en) 1986-11-29 1986-11-29 Arrangement for linearising a transmitter output stage

Publications (1)

Publication Number Publication Date
DE3640969A1 true DE3640969A1 (en) 1988-06-09

Family

ID=6315185

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863640969 Withdrawn DE3640969A1 (en) 1986-06-06 1986-11-29 Arrangement for linearising a transmitter output stage

Country Status (1)

Country Link
DE (1) DE3640969A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10250613A1 (en) * 2002-10-30 2004-05-19 Advanced Micro Devices, Inc., Sunnyvale Integrated radio frequency signal level analyzing circuit for controlling output power of transceiver device, has DC/AC converter to produce AC reference voltage corresponding to reference voltage from reference voltage source
DE102006052866A1 (en) * 2006-11-09 2008-05-21 Rohde & Schwarz Gmbh & Co. Kg Level adjusting device for high frequency output signal of signal generator, has control circuit controlling high frequency output signal of generator in such manner that amplitude of output signal is equal to amplitude of reference signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10250613A1 (en) * 2002-10-30 2004-05-19 Advanced Micro Devices, Inc., Sunnyvale Integrated radio frequency signal level analyzing circuit for controlling output power of transceiver device, has DC/AC converter to produce AC reference voltage corresponding to reference voltage from reference voltage source
US6937847B2 (en) 2002-10-30 2005-08-30 Advanced Micro Devices, Inc. Integrated RF signal level detector usable for automatic power level control
DE10250613B4 (en) * 2002-10-30 2007-02-08 Advanced Micro Devices, Inc., Sunnyvale Integrated RF signal level detector usable for automatic power level control
DE102006052866A1 (en) * 2006-11-09 2008-05-21 Rohde & Schwarz Gmbh & Co. Kg Level adjusting device for high frequency output signal of signal generator, has control circuit controlling high frequency output signal of generator in such manner that amplitude of output signal is equal to amplitude of reference signal

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