WO2003044943A1 - Systemes amplificateurs de puissance a dispositif de predistortion comprenant des modulateurs de vecteurs - Google Patents

Systemes amplificateurs de puissance a dispositif de predistortion comprenant des modulateurs de vecteurs Download PDF

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Publication number
WO2003044943A1
WO2003044943A1 PCT/EP2002/012614 EP0212614W WO03044943A1 WO 2003044943 A1 WO2003044943 A1 WO 2003044943A1 EP 0212614 W EP0212614 W EP 0212614W WO 03044943 A1 WO03044943 A1 WO 03044943A1
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WO
WIPO (PCT)
Prior art keywords
signals
arrangement according
harmonic
power amplifier
vector
Prior art date
Application number
PCT/EP2002/012614
Other languages
English (en)
Inventor
Julian Richard Trinder
Original Assignee
Roke Manor Research Limited
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 Roke Manor Research Limited filed Critical Roke Manor Research Limited
Priority to AU2002358497A priority Critical patent/AU2002358497A1/en
Publication of WO2003044943A1 publication Critical patent/WO2003044943A1/fr

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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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • 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
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3252—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using multiple parallel paths between input and output
    • 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
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3258—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits based on polynomial terms

Definitions

  • This invention relates to power amplifier arrangements, and more particularly to arrangements intended to improve the linearity of power amplifiers, and it relates more especially, though not exclusively, to arrangements intended to reduce third-order intermodulation distortion in power amplifiers.
  • the invention thus provides, f om one aspect, a power amplifier arrangement wherein radio frequency (RF) signals for amplification and signals at the second harmonic thereof are each derived from respective vector modulation stages and the respective vector modulated signals are combined for application to the power amplifier, thereby injecting the second-harmonic signals into the power amplifier.
  • RF radio frequency
  • the respective vector modulation stages are each supplied with signals derived from a common baseband modulator, and it is further preferred that signals derived from the common baseband modulator and intended for application to the vector modulation stage providing said second-harmonic signals are operated upon by a baseband processing function before such application.
  • scaling means are provided to adjust the relative amplitudes of said radio frequency (RF) signals for amplification and said signals at the second harmonic thereof. It is also preferred that the scaling means comprises an amplitude adjustment component disposed to influence the amplitude of said second-harmonic signals. In such circumstances, the scaling means may be disposed to operate either directly upon the said second harmonic signals themselves, or upon the signals derived from the common baseband modulator and intended for application to the vector modulation stage, preferably after they have been operated upon by the aforementioned baseband processing function.
  • RF radio frequency
  • a further scaling means are provided to permit common adjustment of the overall amplitude of said signals; said further scaling means being disposed so as to operate directly upon the signals derived from said common baseband modulator.
  • each vector modulation stage comprises a respective pair of Gilbert-cell mixers having their differential collector ports connected in parallel.
  • Figures 1 and 2 show, in schematic diagrammatic form, power amplifier arrangements incorporating known techniques for second-harmonic injection
  • FIGS. 3 and 4 show, also in schematic diagrammatic form, power amplifier arrangements in accordance with exemplary embodiments of the invention.
  • Figure 5 shows, again in schematic diagrammatic form, an implementation of a power amplifier arrangement in accordance with an example of the invention.
  • VBE VBIAS + v(t), hence:
  • Vo Is.RL.exp ⁇ VBiAs/V ⁇ .
  • V(t) go + gl.V(t) + g2.V(t) 2 + g3.v(t) 3 + g4.v(t) 4 + g5.V(t) 5 + ....
  • An RF modulator 1 generates source signals which, in an uncorrected arrangement, would be applied to a power amplifier shown in phantom at 2.
  • a second channel of circuitry shown generally at 3, is provided.
  • the second harmomc of the RF signal is generated in a squaring circuit 4, typically a mixer and applied, by way of a band pass filter 5 and a scaling component 6, to a combining circuit 7 which also receives the signals from the RF modulator 1.
  • the output of the combining circuit 7 is applied to the input of the power amplifier 2, thereby injecting into the power amplifier a second-harmonic component of the RF signal derived by way of the channel 3.
  • the second harmonic scaling factor b2 imposed by the component 6 is typically -1.5(g3/g2), and it is usual also to impose a common scaling factor, bl, directly upon the signals output from the RF modulator 1; this being achieved by means of a conventional component 8 of any convenient kind.
  • a band pass filter 9 it is necessary to introduce a band pass filter 9 into the path of the RF signals fed from the modulator 1 to the mixer 7, in order to match the group-delay response of the filter 5 in channel 3 and, as mentioned previously, this leads to difficulties associated with the need for accurate gain and phase matching of the two band pass filters 5 and 9.
  • the band pass filters 5 and 9 are omitted, as shown in Figure 2, where components similar to those already described with reference to Figure 1 are given the same reference numbers, the range of signals applied to the power amplifier 2 now extends down to d.c, which is normally not practicable.
  • the second harmonic scaling factor b2 typically reduces to -0.5(g3/g2).
  • This embodiment of the invention overcomes the difficulties associated with the known arrangements described with reference to Figures 1 and 2 by employing a simple baseband processor and a pair of vector I/Q modulators.
  • a baseband modulator 10 applies I and Q components Xr and xi respectively to a vector modulator 11 driven by an operating carrier sin( ⁇ )o.t).
  • the I and Q signals are, as before, subjected at 12 to a scaling factor bl, and the output of the vector modulator 11 is applied to a combining circuit 13.
  • the output of the combining circuit 13 is applied as the input to power amplifier 17, and it will thus be appreciated that, in this embodiment of the invention, the arrangement is such that the wanted modulation is applied to the carrier signal sin( ⁇ 0 .t) using a conventional I/Q vector modulator (11).
  • the output of the vector modulator 11 is thus sin( ⁇ 0 .t + ⁇ m ), where ⁇ m represents the wanted modulation.
  • the second vector modulator (15) is used to generate the second-harmonic zone, utilising a quadrature carrier cos(2 ⁇ 0 .t).
  • the baseband processor 14 generates, as indicated above, the signals y r and y., representing the square of the baseband function and the resultant second harmonic zone signal is
  • the invention provides efficient power amplifier arrangements in which significant hardware simplification is possible.
  • a vector modulator can readily be implemented using a pair of Gilbert-cell mixers having their differential collector ports connected in parallel.
  • Local oscillator phasing is normally accomplished utilising highspeed digital dividers or poly-phase networks.
  • Two vector modulators (four mixers) can thus readily be integrated, with their differential output ports connected together into a single differential load, thus eliminating the need for a separate combining circuit such as that shown at 13 in Figures 3 and 4. Moreover, the local oscillator requirements of the two vector modulators 11 and 15 have a strict harmonic relationship which lends itself to an integrated solution using high-speed digital dividers.
  • a streamlined implementation of the invention provides an arrangement in which a baseband modulator 21 feeds a baseband processor 22 which provides four analogue outputs (xr, Xi, z r and zi) that feed an integrated dual vector modulator 23 with built-in local oscillator processing, and a power amplifier 24.
  • the invention provides power amplifier arrangements in which linearisation of the power amplifier can be achieved by second harmonic injection, without the need for either matched group-delay band pass filters or ultra-wideband signal paths.
  • the power amplifier is presented with two signals, one (the main signal) being confined to the fundamental region and the other, the secondary signal, being confined to the second harmonic region.
  • the secondary signal is scaled, relative to the primary signal, by a factor dependent upon the ratio of the power amplifier's third- and second- order polynomial coefficients.
  • auxiliary baseband processor and a second vector modulator which can beneficially, as explained above, be integrated with the first vector modulator, is important to the invention, as it permits creation of the second harmonic zone signal without requiring matched group-delay band pass filters.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Amplifiers (AREA)

Abstract

La présente invention concerne des systèmes conçus pour améliorer la linéarité d'amplificateurs de puissance, et notamment des systèmes conçus pour diminuer la distortion d'intermodulation de troisième ordre dans des amplificateurs de puissance. L'invention concerne la linéarisation d'un amplificateur de puissance par injection de second harmonique, sans l'aide de filtres passe-bande à retard de groupe adapté ou de parcours de signaux à bande ultra-large, par utilisation de modulateurs de vecteurs pour deux ensembles de signaux, l'un (le signal principal) étant confiné à la région fondamentale et l'autre, le signal secondaire, étant confiné à la région de second harmonique. Le signal secondaire est soumis au traitement de bande de base et est calibré, relativement au signal principal, à l'aide d'un facteur dépendant du rapport des coefficients polynomiaux de deuxième et troisième ordres de l'amplificateur de puissance. De préférence, les modulateurs de vecteurs sont intégrés, leurs ports de sortie différentielle étant connectés entre eux en une charge différentielle unique et des diviseurs numériques à vitesse élevée sont également intégrés de manière à satisfaire les exigences de l'oscillateur local des modulateurs de vecteurs.
PCT/EP2002/012614 2001-11-22 2002-11-12 Systemes amplificateurs de puissance a dispositif de predistortion comprenant des modulateurs de vecteurs WO2003044943A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002358497A AU2002358497A1 (en) 2001-11-22 2002-11-12 Power amplifier arrangements with predistorter comprising vector modulators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0128010.6 2001-11-22
GB0128010A GB2382480B (en) 2001-11-22 2001-11-22 Power amplifier arrangements

Publications (1)

Publication Number Publication Date
WO2003044943A1 true WO2003044943A1 (fr) 2003-05-30

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ID=9926258

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Application Number Title Priority Date Filing Date
PCT/EP2002/012614 WO2003044943A1 (fr) 2001-11-22 2002-11-12 Systemes amplificateurs de puissance a dispositif de predistortion comprenant des modulateurs de vecteurs

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AU (1) AU2002358497A1 (fr)
GB (1) GB2382480B (fr)
WO (1) WO2003044943A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2512912B (en) 2013-04-11 2017-06-14 Broadcom Corp Apparatus and Method for Signal Predistortion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424680A (en) * 1993-11-30 1995-06-13 Harmonic Lightwaves, Inc. Predistorter for high frequency optical communications devices
EP0731556A1 (fr) * 1995-03-06 1996-09-11 NEC Corporation Amplificateur de puissance linéaire utilisant des valeurs de correction mises à jour en amplitude et en phase
US6108385A (en) * 1996-07-08 2000-08-22 Silicon Wireless Limited Method and apparatus for reducing intermodulation distortion in digital wideband transmission systems
WO2001056146A1 (fr) * 2000-01-26 2001-08-02 Nokia Corporation Procede et systeme destines a compenser des non linearites et des changements a variation temporelle d'une fonction de transfert agissant sur un signal d'entree
US6275103B1 (en) * 1998-09-02 2001-08-14 Fujitsu Limited Predistorter of amplifier and amplifying unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5838195A (en) * 1996-08-06 1998-11-17 Northrop Grumman Corporation Reduction of second order harmonic distortion in high power TWT amplifiers
AU3067400A (en) * 1999-02-12 2000-08-29 Wireless Systems International Limited Signal processing apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424680A (en) * 1993-11-30 1995-06-13 Harmonic Lightwaves, Inc. Predistorter for high frequency optical communications devices
EP0731556A1 (fr) * 1995-03-06 1996-09-11 NEC Corporation Amplificateur de puissance linéaire utilisant des valeurs de correction mises à jour en amplitude et en phase
US6108385A (en) * 1996-07-08 2000-08-22 Silicon Wireless Limited Method and apparatus for reducing intermodulation distortion in digital wideband transmission systems
US6275103B1 (en) * 1998-09-02 2001-08-14 Fujitsu Limited Predistorter of amplifier and amplifying unit
WO2001056146A1 (fr) * 2000-01-26 2001-08-02 Nokia Corporation Procede et systeme destines a compenser des non linearites et des changements a variation temporelle d'une fonction de transfert agissant sur un signal d'entree

Also Published As

Publication number Publication date
GB2382480B (en) 2005-03-30
AU2002358497A1 (en) 2003-06-10
GB0128010D0 (en) 2002-01-16
GB2382480A (en) 2003-05-28

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