GB0822489D0 - Quadrature pulse-width modulation methods and apparatus - Google Patents

Quadrature pulse-width modulation methods and apparatus

Info

Publication number
GB0822489D0
GB0822489D0 GBGB0822489.1A GB0822489A GB0822489D0 GB 0822489 D0 GB0822489 D0 GB 0822489D0 GB 0822489 A GB0822489 A GB 0822489A GB 0822489 D0 GB0822489 D0 GB 0822489D0
Authority
GB
United Kingdom
Prior art keywords
width modulation
modulation methods
quadrature pulse
quadrature
pulse
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Withdrawn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
GBGB0822489.1A
Other versions
GB2456889A (en
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
Priority claimed from US12/135,326 external-priority patent/US8179957B2/en
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB0822489D0 publication Critical patent/GB0822489D0/en
Publication of GB2456889A publication Critical patent/GB2456889A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching 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
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3294—Acting on the real and imaginary components of the input signal
    • 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
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
    • 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
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4902—Pulse width modulation; Pulse position modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/336—A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/351—Pulse width modulation being used in an amplifying circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)
GB0822489A 2007-12-11 2008-12-10 A PWM modulator for a Cartesian transmitter Withdrawn GB2456889A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1282707P 2007-12-11 2007-12-11
US12/135,326 US8179957B2 (en) 2007-12-11 2008-06-09 Quadrature pulse-width modulation methods and apparatus

Publications (2)

Publication Number Publication Date
GB0822489D0 true GB0822489D0 (en) 2009-01-14
GB2456889A GB2456889A (en) 2009-08-05

Family

ID=40289773

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0822489A Withdrawn GB2456889A (en) 2007-12-11 2008-12-10 A PWM modulator for a Cartesian transmitter

Country Status (1)

Country Link
GB (1) GB2456889A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114172497A (en) * 2021-12-06 2022-03-11 中国人民解放军国防科技大学 5-level radio frequency pulse width modulation method and modulator without spectrum aliasing

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2424115B1 (en) * 2010-08-23 2017-03-08 Alcatel Lucent A method for pulse length modulation of signals using calibration signals, and a modulation device therefor
EP2575309B1 (en) * 2011-09-22 2014-11-05 Alcatel Lucent A method for pulse width modulation, and a transmitter therefor
US9543910B2 (en) 2015-03-06 2017-01-10 Apple Inc. Radio frequency system switching power amplifier systems and methods
EP3211800B1 (en) 2016-02-25 2019-10-16 Huawei Technologies Co., Ltd. Signal processing arrangement for a transmitter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB977806A (en) * 1962-06-13 1964-12-16 Ferguson Radio Corp A linear pulse width modulator
WO2007083281A1 (en) * 2006-01-23 2007-07-26 Nxp B.V. Cartesian modulation system via multi-level pulse width modulation
JP5006403B2 (en) * 2006-10-27 2012-08-22 テレフオンアクチーボラゲット エル エム エリクソン（パブル） Switch modulation of radio frequency amplifiers
WO2008076021A1 (en) * 2006-12-18 2008-06-26 Telefonaktiebolaget Lm Ericsson (Publ) Pulse width modulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114172497A (en) * 2021-12-06 2022-03-11 中国人民解放军国防科技大学 5-level radio frequency pulse width modulation method and modulator without spectrum aliasing
CN114172497B (en) * 2021-12-06 2023-08-15 中国人民解放军国防科技大学 Spectrum aliasing-free 5-level radio frequency pulse width modulation method and modulator

Also Published As

Publication number Publication date
GB2456889A (en) 2009-08-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)