GB0822488D0 - Pulse-width modulator methods and apparatus - Google Patents

Pulse-width modulator methods and apparatus

Info

Publication number
GB0822488D0
GB0822488D0 GB0822488A GB0822488A GB0822488D0 GB 0822488 D0 GB0822488 D0 GB 0822488D0 GB 0822488 A GB0822488 A GB 0822488A GB 0822488 A GB0822488 A GB 0822488A GB 0822488 D0 GB0822488 D0 GB 0822488D0
Authority
GB
United Kingdom
Prior art keywords
pulse
width modulator
methods
modulator methods
width
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Withdrawn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
GB0822488A
Other versions
GB2456888A (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 US12/127,126 external-priority patent/US7760041B2/en
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB0822488D0 publication Critical patent/GB0822488D0/en
Publication of GB2456888A publication Critical patent/GB2456888A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0294—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using vector summing of two or more constant amplitude phase-modulated signals
    • 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
    • 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
    • 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
    • H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
    • 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
    • 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
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Amplifiers (AREA)
GB0822488A 2007-12-11 2008-12-10 A modulator for a LINC radio transmitter with switching amplifiers Withdrawn GB2456888A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1282807P 2007-12-11 2007-12-11
US12/127,126 US7760041B2 (en) 2007-12-11 2008-05-27 Pulse-width modulator methods and apparatus

Publications (2)

Publication Number Publication Date
GB0822488D0 true GB0822488D0 (en) 2009-01-14
GB2456888A GB2456888A (en) 2009-08-05

Family

ID=40289772

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0822488A Withdrawn GB2456888A (en) 2007-12-11 2008-12-10 A modulator for a LINC radio transmitter with switching amplifiers

Country Status (1)

Country Link
GB (1) GB2456888A (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346354A (en) * 1980-09-29 1982-08-24 Continental Electronics, Inc. Amplitude modulator using variable width rectangular pulse generator
US4540957A (en) * 1983-05-06 1985-09-10 Continental Electronics Mfg. Co. Amplitude modulator forms two phase-shifted pulse trains and combines them
US5838210A (en) * 1997-12-01 1998-11-17 Motorola, Inc. Method and apparatus for generating a modulated signal
US7460612B2 (en) * 2004-08-12 2008-12-02 Texas Instruments Incorporated Method and apparatus for a fully digital quadrature modulator
WO2007060562A1 (en) * 2005-11-23 2007-05-31 Nxp B.V. Polar modulation system

Also Published As

Publication number Publication date
GB2456888A (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)