EP1405405A2 - Procede de regulation de l'amplification d'un signal haute frequence - Google Patents

Procede de regulation de l'amplification d'un signal haute frequence

Info

Publication number
EP1405405A2
EP1405405A2 EP02752974A EP02752974A EP1405405A2 EP 1405405 A2 EP1405405 A2 EP 1405405A2 EP 02752974 A EP02752974 A EP 02752974A EP 02752974 A EP02752974 A EP 02752974A EP 1405405 A2 EP1405405 A2 EP 1405405A2
Authority
EP
European Patent Office
Prior art keywords
receiving unit
correction
transmitting
amplitude
signal
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Withdrawn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
EP02752974A
Other languages
German (de)
English (en)
Inventor
Roland Jenkins
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.)
Thales DIS AIS Deutschland GmbH
Original Assignee
Siemens AG
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
Priority claimed from DE10132047.7A external-priority patent/DE10132047B4/de
Priority claimed from DE2001136213 external-priority patent/DE10136213A1/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1405405A2 publication Critical patent/EP1405405A2/fr
Withdrawn legal-status Critical Current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
    • 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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/004—Control by varying the supply voltage

Definitions

  • the present invention relates to a method for regulating the amplification of a high-frequency signal, a transmitting and / or receiving unit and a communication system.
  • modulation methods are used, in particular in the case of mobile radio connections, which influence both the amplitude or an envelope curve and the phase position of the signal to be transmitted.
  • GSM global standard for mobile communication
  • EDGE Enhanced data rate for GSM evolution or EDGE
  • CDMA code division multiple access
  • Amplitude modulation is applied to the transmission signal separately from the phase modulation, two separate control loops being provided for this purpose.
  • the method can e.g. B. by modulating the supply voltage of a strongly non-linear in C, D or E operation
  • Power amplifiers are implemented. According to the Polar Loop concept, optimized transmitter amplifiers can be used in addition to compliance a required linearity also reduce power consumption. Since in particular in a mobile radio connection at least one subscriber terminal is designed as a mobile phone, the costs for a rechargeable battery of a mobile phone are significantly reduced and / or a maximum operating time of a charged battery pack is increased.
  • the control slope of the transmitter amplifier changes. This also changes the control loop bandwidth of the amplitude control loop. This leads to an undesirable distortion of the output voltage, which is particularly evident in a deterioration of the modulation spectrum up to the violation of the spectrum mask prescribed by a standard.
  • a known solution to this problem is to isolate the transmitter amplifier from the antenna by using circulators or isolators.
  • circulators are relatively narrow-band components, so that several circulators must be interconnected to cover a larger bandwidth.
  • these components are very expensive and also take up a very large amount of space, which makes the polar loop concept, which is actually very advantageous, more economical, particularly in so-called multiband devices, due to the use of several circulators
  • an amplitude modulation is contained in the modulation of the transmission signal.
  • the modulation can e.g. B. by varying the drain voltage in field effect transistors or the collector voltage in bipolar transistors and the anode voltage in tubes of the transmitter amplifier.
  • a parasitic phase occurs due to the phase of the complex transfer function S 2 ⁇ which is dependent on the drain-source voltage U D s or U D or the collector-emitter voltage U CE
  • Phase modulation If the modulation used in the radio transmission system consists of a combination of amplitude and phase modulation, e.g. is the case in mobile radio systems of G2, 5 and G3, the proportion of phase modulation is falsified by an additional parasitic phase modulation component ⁇ (A (t)). This falsification has z. B. an increased error vector and / or an increased bandwidth requirement.
  • Mobile phone connections can therefore be due to parasitic phase modulation as well as due to the changes in the accuracy of an antenna or the like. Effects on the respective control loops occur.
  • the present invention is therefore based on the object of proposing a method and a device for improved use of a polar loop concept in a transmitter, in particular for a mobile radio connection.
  • the basic idea of the present invention is to output an output voltage
  • Combination can be combined into a component. The same also applies to the communication systems according to claims 16 or 30.
  • a method according to the invention is therefore characterized in that an output voltage of the battery voltage modulator is evaluated as a measure of the change in the control loop bandwidth of the amplitude control loop in a polar loop transmitter in the event of a faulty termination at the output of the transmitter amplifier.
  • This signal is advantageously already present in known circuits, so that no additional measuring points and / or measuring devices have to be provided. So that's it advantageously possible, the output voltage of the battery voltage modulator
  • the battery voltage modulator As an indicator of a change in the control loop bandwidth of the amplitude control loop and to use it for a correction.
  • Battery voltage modulator determines a correction value by which the change in the control slope of the transmitter amplifier and thus the control loop bandwidth is compensated.
  • a control signal of the battery voltage modulator is changed by this correction value, in particular by driving a controlled intermediate amplifier.
  • the control loop bandwidth is therefore, in particular indirectly, adjusted on the basis of a characteristic field recorded once for a transmitter amplifier or a whole series of transmitter amplifiers by a new control loop.
  • a method according to the invention can be integrated in a transmitting and / or receiving unit with very little additional circuitry.
  • an additional space requirement and self-energy requirement of an extended circuit are very small. Even creating or
  • a method according to the invention can be used particularly advantageously in a communication system which has at least one Transmission line includes according to a mobile radio standard.
  • a transmitting and / or receiving unit is designed as part of such a communication system as a mobile phone. Because of the advantages mentioned above, however, a method according to the invention can also advantageously be used or retrofitted in any other transmitting and / or receiving unit.
  • An inventive method according to claim 17 is characterized in that an output voltage of
  • Battery voltage modulator is evaluated as a measure of an expected phase error of the amplifier of the transmitter amplifier. On the output voltage of the
  • the battery voltage modulator can easily be accessed directly as a signal within a circuit operating according to this method, so that no additional measuring points and / or measuring devices have to be provided. It is thus advantageously possible to use the output voltage of the battery voltage modulator as an indicator of a phase error of the amplifier and to use it for
  • a correction value is determined with a current output voltage of the battery voltage modulator, by means of which the incorrect change in the phase transmission of the transmitter amplifier is essentially compensated for.
  • this correction value is taken from a characteristic curve. Such a characteristic is preferably also taken into account
  • Tolerance values are stored digitally in a memory.
  • the required correction values can be quickly read out in a known manner via accesses with AD and DA converters.
  • the phase behavior is therefore adjusted on the basis of a characteristic field recorded once for a transmitter amplifier or for a whole series of transmitter amplifiers by means of a compensation circuit.
  • the phase of the complex circuit parameter S 2 ⁇ of the transmitter amplifier depends on the voltage U DS or U CE as an increasing function.
  • the parasitic phase modulation can thus be neutralized by the phase of the parameter S 2 ⁇ being designed as a falling function as a function of the gate-source voltage U G s or the base current I B. This falling function is then suitably with U DS or U CE , the output signal of
  • Correction value for a specific band is set using a simple voltage divider.
  • a corresponding circuit and measurement results are shown using a specific embodiment with reference to the drawing.
  • a method according to the invention can be integrated in a transmitting and / or receiving unit with very little additional circuitry.
  • an additional space requirement and self-energy requirement of an extended circuit are very small.
  • the creation or recording of the above-mentioned characteristic curves is also associated with relatively little effort, so that a method according to the invention can be used particularly advantageously in a communication system which comprises at least one transmission link according to a mobile radio standard.
  • a transmitting and / or receiving unit is designed as part of such a communication system as a mobile phone. Because of the advantages mentioned above, however, a method according to the invention can also be used in any other transmission and / or
  • Receiver unit can be used advantageously or retrofitted.
  • the compact design also enables high integration in multi-band systems for mobile phones.
  • Fig. 1 shows a simplified block diagram for
  • FIG. 2 shows a simplified block diagram of an embodiment according to the invention.
  • Fig. 3 shows a simplified block diagram for
  • FIG. 1; Fig. 4 shows a simplified block diagram of an embodiment according to the invention with a
  • FIG. 5 graphically shows measurement data of a real amplifier as gain and phase position for an input power and FIG. 6 shows the data for another input power as curves;
  • FIG. 7 shows a measured spectrum without and FIG. 8 the measured spectrum of the same amplifier
  • Figure 2 relates to
  • FIGS. 3 to 9 relate to an exemplary embodiment of the invention, in which a parasitic
  • Phase modulation should be neutralized.
  • a polar loop control phase position and amplitude are an error-free input signal U so ⁇ a polar loop transmitter PLS in a phase comparator ⁇ and an amplitude comparator A in separate control circuits with a defined part of an output signal U out compared and, if appropriate, adjusted.
  • the defined part of the output signal U out is fed back as a sample via a feedback branch F with an adaptation or damping factor a to the input of the polar loop transmitter PLS.
  • the output signal U out represents the signal of the polar loop transmitter PLS delivered to an antenna ANT.
  • a directional coupler RK separates between the output of the
  • Transmitter amplifier PA and the antenna ANT a leading wave of the output signal U out and a returning wave, which is generated by reflection of the antenna ANT, which is generally not matched to the wave resistance of the feed line.
  • the signal U out thus only represents the leading wave.
  • the output signal of the phase comparator ⁇ regulates the phase position of U out by means of a voltage-controlled oscillator VCO to the setpoint specified by U so ⁇ .
  • the amplitude comparator A influences the control signal U am via a battery voltage modulator M.
  • Usoii is.
  • the slope of the transmitter amplifier PA depends on a respective load of a termination. This changes a misclosure by changing the impedance of the
  • Antenna ANT also the steepness of the transmitter amplifier PA. Such changes in impedance are quickly realized
  • Amplitude control loop is kept substantially constant, so a change in the slope of the transmitter amplifier PA affects directly on the
  • the aim of an embodiment according to the invention according to FIG. 2 is to keep the control loop bandwidth of the amplitude control loop in the polar loop transmitter PLS constant even when the impedance of the antennas ANT changes and the resulting faulty termination, so as to maintain the required linearity of the
  • a faulty termination of the transmitter amplifier PA due to changes in the impedance of an antenna ANT wants to produce a change in the output signal U out .
  • the signal U c is generated at the output of the battery voltage modulator M and is followed up via the amplitude control loop until a deviation of U out from a predetermined value is corrected.
  • U D can thus serve as an indicator of load changes.
  • the output voltage U c of the battery voltage modulator M is subsequently assessed as a measure of the change in the control loop bandwidth of the amplitude control loop in the polar loop transmitter PLS in the event of a faulty termination at the output of the transmitter amplifier PA.
  • a correction value U k ⁇ rr is generated, with which the original control loop bandwidth can be restored.
  • a circuit according to FIG. 1 is advantageously assumed, which is only slightly expanded in a manner shown in the illustration in FIG. 2 by small circuit additions.
  • the current output voltage U D of the battery voltage modulator M is read out by a system control SC newly added in the circuit of FIG. 2. Since U ao n and a damping a of the feedback branch F of the system control are known, the current control steepness S of the transmitter amplifier PA can
  • U r U r can be determined.
  • the output voltage U D of the battery voltage modulator M is converted from the battery voltage U DD by means of an analog-digital converter ADC for processing.
  • a correction value Ukorr can be found by comparing a digitized value with a steepness S of the transmitter amplifier PA once determined at a standard conclusion.
  • the correction value U k0 r r is either directly or, as shown in the present exemplary embodiment, by means of a digital / analog converter DAC in one adjustable amplifier VGA specified.
  • Loop bandwidth is restored.
  • a characteristic that is essentially constant over the predetermined bandwidth is guaranteed while observing the standards.
  • System control SC can then be retrofitted in a particularly simple manner in each polar loop transmitter PLS.
  • the entire circuit of the PLS polar loop transmitter can also be designed as a highly integrated circuit, with further hybrid components such as isolators advantageously being dispensed with even in the case of even higher multi-band systems for mobile telephones.
  • a device according to the invention is therefore designed to be suitable for use in several frequency bands.
  • Phase modulation is only one in Fig. 1 with Dashed line enclosed section of the polar loop transmitter PLS with the applied signals shown enlarged.
  • a battery voltage modulator M is connected to a supply voltage U DD , which is fed into the transmitter amplifier PA by the signal Ui n as an input signal as an output signal U D (A (t)) which changes in amplitude according to the specification A (t).
  • U D (A (t)) an input signal Ui is n as a cosine-shaped wave having a time-varying phase term ⁇ (t) and amplifies an information in the amplitude A (t). So it turns out to be
  • Output signal of this circuit an over time t cosine-shaped oscillation with a time-varying amplitude A (t), a time-varying phase term ⁇ (t) and an additional phase shift ⁇ (A (t)) dependent on the size of the input signal U ⁇ n .
  • Phase shift ⁇ (A (t)) has a negative effect as a phase error or as parasitic phase modulation in the output signal due to information errors.
  • the signal U D (A (t)) is used to largely eliminate the expected phase error ⁇ (A (t)) by a correction variable k as a function of the size of the signal U D (A (t (t )) determined from a circuit K and fed together with the cosine-shaped oscillation Ui n as an input signal into the transmitter amplifier PA.
  • k is designed as a factor with which the size of the signal U D (A (t)) is suitably adapted to minimize the phase error ⁇ (A (t)).
  • the correction via the bias voltage U b ias is introduced with the signal U GS to change the operating point of the transmitter amplifier PA. It has been found that a change in the operating point setting in time with the signal U D (A (t)) has an opposite effect to the parasitic phase effect. In this way, an essentially undisturbed phase curve is guaranteed in compliance with a prescribed standard in a polar loop transmitter PLS as shown in FIG. 4.
  • Figure 7 shows the modulation spectrum of the EDGE transmitter with constant bias voltage U B i as .
  • the spectrum is asymmetrical, which clearly indicates the occurrence of an undesirable phase modulation. Compliance with a planned modulation spectrum or adjacent channel power rejection ACPR from a center frequency at + 400 kHz is therefore approx. 56dBc, as measured between the positions marked by two arrows.
  • Figure 8 shows the modulation spectrum of the same EDGE transmitter with the modification that the so-called blow input for setting the correction factor k is connected to the drain voltage U D (A (t)) via a simple ohmic voltage divider.
  • the spectrum is largely symmetrical using this simple correction circuit K, as a result of which the proportion of undesired phase modulation in the output signal has now been greatly reduced.
  • the attenuation to an adjacent channel ACPR at -400 kHz and + 400 kHz from the center frequency is now likewise an improved value of approximately 61 dBc, again measured between the arrows at the positions according to FIG. 4.
  • FIG. 9 shows the structure chosen in the present exemplary embodiment analogous to the illustration of FIG. 4.
  • the correction circuit K for setting the correction factor k comprises only a simple ohmic voltage divider, the free end point of which is at a fixedly adjustable potential V. lies.
  • V fixedly adjustable potential
  • a plurality of such correction circuits K with respective potentials V can be provided, which are switched on as required or when a band is selected.
  • the advantages of the described embodiment are, for. B. in the case of dual band mobile radio, in particular in that static or non-volatile memories of the correction variables k can be used in particular in the form of fixed voltage dividers which are assigned a value for each of the selectable bands.
  • a device according to the invention is designed to be suitable for use in several frequency bands, in particular for mobile telephones designed for multi-band systems.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

La présente invention concerne un procédé destiné à la régulation de l'amplification d'un signal haute fréquence, une unité d'émission et/ou réception et un système de communication. L'invention a pour objet la mise au point d'un procédé et d'un dispositif faisant meilleure utilisation d'un concept à boucle polaire dans un émetteur destiné notamment à une connexion radio mobile. A cet effet, dans le cadre d'un procédé de régulation de l'amplification d'un signal haute fréquence dans lequel la position de phase et l'amplitude d'un signal d'entrée dépourvu d'erreurs (Usoll) sont comparées séparément avec une partie définie d'un signal de sortie (Uout) et ensuite régulées, une tension de sortie (Uc) d'un modulateur de tension de batterie (M) étant évaluée en tant que grandeur représentative d'une erreur au niveau d'une sortie d'un amplificateur d'émission (PA) et utilisée pour réaliser une correction.
EP02752974A 2001-07-03 2002-06-28 Procede de regulation de l'amplification d'un signal haute frequence Withdrawn EP1405405A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10132047 2001-07-03
DE10132047.7A DE10132047B4 (de) 2001-07-03 2001-07-03 Verfahren zur Regelung der Verstärkung eines hochfrequenten Signals
DE2001136213 DE10136213A1 (de) 2001-07-25 2001-07-25 Verfahren zur Neutralisation parasitärer Phasenmodulation in amplitudenmodulierten Verstärkern
DE10136213 2001-07-25
PCT/DE2002/002279 WO2003005564A2 (fr) 2001-07-03 2002-06-28 Procede de regulation de l'amplification d'un signal haute frequence

Publications (1)

Publication Number Publication Date
EP1405405A2 true EP1405405A2 (fr) 2004-04-07

Family

ID=26009628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02752974A Withdrawn EP1405405A2 (fr) 2001-07-03 2002-06-28 Procede de regulation de l'amplification d'un signal haute frequence

Country Status (5)

Country Link
US (1) US7386287B2 (fr)
EP (1) EP1405405A2 (fr)
JP (1) JP2004534469A (fr)
CN (1) CN1327609C (fr)
WO (1) WO2003005564A2 (fr)

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US7983632B2 (en) * 2004-09-24 2011-07-19 Broadcom Corporation Feedback control loop for amplitude modulation in a polar transmitter with a translational loop
DE102004054586B4 (de) * 2004-11-11 2010-10-21 Palm, Inc. (n.d.Ges. d. Staates Delaware), Sunnyvale Verfahren und Vorrichtung zur Verstärkung eines amplituden- und phasenmodulierten elektrischen Signals
DE102005001496B4 (de) * 2005-01-12 2008-08-28 Siemens Ag Verfahren und Vorrichtung zur Verstärkung eines amplituden- und phasenmodulierten elektrischen Signals
US7460842B2 (en) * 2005-09-08 2008-12-02 Motorola, Inc. Wireless transmitter having polar loop controller with current feedback and methods
US20090011730A1 (en) * 2007-07-05 2009-01-08 Matsushita Electric Industrial Co., Ltd. Methods and Apparatus for Controlling Power in a Polar Modulation Transmitter
DE102007055529A1 (de) * 2007-08-06 2009-02-12 Rhode & Schwarz Gmbh & Co. Kg Verfahren und Anordnung zum Erzeugen eines frequenzmodulierten Signals
FI20075958A0 (fi) * 2007-12-21 2007-12-21 Nokia Corp Lähetettävien signaalien prosessointi radiolähettimessä
US8620606B2 (en) * 2008-04-11 2013-12-31 Bird Technologies Group Inc. Transmitter power monitor
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WO2013133170A1 (fr) * 2012-03-06 2013-09-12 日本電気株式会社 Dispositif de transmission
EP3267578B1 (fr) 2016-07-08 2023-04-19 IMEC vzw Émetteur polaire et procédé permettant de générer un signal d'émission au moyen d'un émetteur polaire

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Also Published As

Publication number Publication date
CN1327609C (zh) 2007-07-18
US7386287B2 (en) 2008-06-10
WO2003005564A3 (fr) 2003-12-11
WO2003005564A2 (fr) 2003-01-16
CN1529933A (zh) 2004-09-15
US20040185809A1 (en) 2004-09-23
JP2004534469A (ja) 2004-11-11

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