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GB2368214B - Communications systems - Google Patents

Communications systems

Info

Publication number
GB2368214B
GB2368214B GB0025436A GB0025436A GB2368214B GB 2368214 B GB2368214 B GB 2368214B GB 0025436 A GB0025436 A GB 0025436A GB 0025436 A GB0025436 A GB 0025436A GB 2368214 B GB2368214 B GB 2368214B
Authority
GB
United Kingdom
Prior art keywords
communications systems
communications
systems
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.)
Expired - Fee Related
Application number
GB0025436A
Other versions
GB0025436D0 (en
GB2368214A (en
Inventor
Jonas Persson
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to GB0025436A priority Critical patent/GB2368214B/en
Publication of GB0025436D0 publication Critical patent/GB0025436D0/en
Priority to CN01820513.5A priority patent/CN1252910C/en
Priority to MYPI20014710 priority patent/MY128456A/en
Priority to AU2002223608A priority patent/AU2002223608A1/en
Priority to PCT/EP2001/011716 priority patent/WO2002033820A1/en
Priority to TW090125394A priority patent/TW578407B/en
Priority to US09/977,193 priority patent/US7072420B2/en
Publication of GB2368214A publication Critical patent/GB2368214A/en
Application granted granted Critical
Publication of GB2368214B publication Critical patent/GB2368214B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3282—Acting on the phase and the amplitude of the input signal
    • 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
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
GB0025436A 2000-10-17 2000-10-17 Communications systems Expired - Fee Related GB2368214B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB0025436A GB2368214B (en) 2000-10-17 2000-10-17 Communications systems
CN01820513.5A CN1252910C (en) 2000-10-17 2001-10-10 Communications systems
MYPI20014710 MY128456A (en) 2000-10-17 2001-10-10 Communications systems
AU2002223608A AU2002223608A1 (en) 2000-10-17 2001-10-10 Communications systems
PCT/EP2001/011716 WO2002033820A1 (en) 2000-10-17 2001-10-10 Communications systems
TW090125394A TW578407B (en) 2000-10-17 2001-10-15 Method of adjusting radio frequency signal, method and apparatus of adjusting timing of in-phase and quadrature components in a signal, radio frequency transmitter
US09/977,193 US7072420B2 (en) 2000-10-17 2001-10-16 Communications systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0025436A GB2368214B (en) 2000-10-17 2000-10-17 Communications systems

Publications (3)

Publication Number Publication Date
GB0025436D0 GB0025436D0 (en) 2000-11-29
GB2368214A GB2368214A (en) 2002-04-24
GB2368214B true GB2368214B (en) 2004-11-03

Family

ID=9901458

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0025436A Expired - Fee Related GB2368214B (en) 2000-10-17 2000-10-17 Communications systems

Country Status (2)

Country Link
GB (1) GB2368214B (en)
MY (1) MY128456A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2506192C (en) 2002-11-14 2011-04-05 Houman Jafari Transmitting stage
DE10257435B3 (en) * 2002-11-14 2004-09-09 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. transmitting stage
US8090051B2 (en) 2008-04-29 2012-01-03 Motorola Solutions, Inc. Combined feedback and feed-forward linearization of radio frequency (RF) power amplifiers
US9763195B2 (en) 2015-01-21 2017-09-12 Apple Inc. Dynamic envelope elimination and restoration polar transmitter
EP3382972A1 (en) * 2017-04-01 2018-10-03 Intel IP Corporation Method and circuits for determining signal propagation time mismatches in a modulator

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377519A2 (en) * 1989-01-06 1990-07-11 Nec Corporation Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto
US5148448A (en) * 1989-03-14 1992-09-15 U.S. Philips Corporation Adaptive predistortion circuit with memory
US5598436A (en) * 1993-06-29 1997-01-28 U.S. Philips Corporation Digital transmission system with predistortion
WO1997030521A1 (en) * 1996-02-14 1997-08-21 Glenayre Electronics, Inc. Linear transmitter using predistortion
US5748678A (en) * 1995-07-13 1998-05-05 Motorola, Inc. Radio communications apparatus
EP0907276A1 (en) * 1997-06-30 1999-04-07 Harris Corporation Adaptive pre-distortion apparatus for linearizing an amplifier output within a data transmission system
US5903611A (en) * 1996-03-22 1999-05-11 Matra Communication Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type
WO2000031881A1 (en) * 1998-11-19 2000-06-02 Cadence Design Systems Inc. Linear rf power amplifier and transmitter
WO2000072438A1 (en) * 1999-05-25 2000-11-30 Nokia Networks Oy Linearisation and modulation device
EP1089428A2 (en) * 1999-09-30 2001-04-04 Kabushiki Kaisha Toshiba Nonlinear compensator

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377519A2 (en) * 1989-01-06 1990-07-11 Nec Corporation Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto
US5148448A (en) * 1989-03-14 1992-09-15 U.S. Philips Corporation Adaptive predistortion circuit with memory
US5598436A (en) * 1993-06-29 1997-01-28 U.S. Philips Corporation Digital transmission system with predistortion
US5748678A (en) * 1995-07-13 1998-05-05 Motorola, Inc. Radio communications apparatus
WO1997030521A1 (en) * 1996-02-14 1997-08-21 Glenayre Electronics, Inc. Linear transmitter using predistortion
US5903611A (en) * 1996-03-22 1999-05-11 Matra Communication Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type
EP0907276A1 (en) * 1997-06-30 1999-04-07 Harris Corporation Adaptive pre-distortion apparatus for linearizing an amplifier output within a data transmission system
WO2000031881A1 (en) * 1998-11-19 2000-06-02 Cadence Design Systems Inc. Linear rf power amplifier and transmitter
WO2000072438A1 (en) * 1999-05-25 2000-11-30 Nokia Networks Oy Linearisation and modulation device
EP1089428A2 (en) * 1999-09-30 2001-04-04 Kabushiki Kaisha Toshiba Nonlinear compensator

Also Published As

Publication number Publication date
GB0025436D0 (en) 2000-11-29
GB2368214A (en) 2002-04-24
MY128456A (en) 2007-02-28

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20140313 AND 20140319

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20161017