Source: http://www.google.fr/patents/US7212791
Timestamp: 2013-12-08 18:33:48
Document Index: 213598896

Matched Legal Cases: ['art 112', 'art 115', 'art 113', 'art 114', 'art 115', 'art 115']

Brevet US7212791 - Transmission device and delay time adjustment method thereof - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus » Recherche avanc�e dans les brevets | Connexion Recherche avanc�e dans les brevets BrevetsA transmitter and method to output a stable output signal having low distortion by adjusting a delay time of an amplitude signal path and a phase signal path. In an amplitude phase extracting part, amplitude data and phase data are extracted from a transmit data signal and outputted. The amplitude of...http://www.google.fr/patents/US7212791?utm_source=gb-gplus-shareBrevet US7212791 - Transmission device and delay time adjustment method thereof Num�ro de publicationUS7212791 B2Type de publicationOctroi Num�ro de demandeUS 10/530,990 Date de publication1 mai 2007 Date de d�p�t3 f�vr. 2004 Date de priorit�6 f�vr. 2003�tat de paiement des fraisPay�Autre r�f�rence de publicationCN1701521A, CN100418304C, DE602004013126D1, DE602004013126T2, EP1598943A1, EP1598943A4, EP1598943B1, US20060009169, WO2004070959A1 Num�ro de publication10530990, 530990, US 7212791 B2, US 7212791B2, US-B2-7212791, US7212791 B2, US7212791B2 InventeursMamoru Arayashiki Cessionnaire d'origineMatsushita Electric Industrial Co., Ltd.Citations de brevets (25), R�f�renc� par (14), Classifications (22), �v�nements juridiques (2) Liens externes: USPTO, Cession USPTO, EspacenetTransmission device and delay time adjustment method thereofUS 7212791 B2 R�sum� A transmitter and method to output a stable output signal having low distortion by adjusting a delay time of an amplitude signal path and a phase signal path. In an amplitude phase extracting part, amplitude data and phase data are extracted from a transmit data signal and outputted. The amplitude of the amplitude data is modulated in an amplitude modulating part and an amplitude modulating signal is outputted; the phase of the phase data is modulated and a phase modulating signal is outputted. In a non-linear amplifying part, the phase modulating signal is multiplied by the amplitude modulating signal to output an RF signal with a prescribed gain amplified. A delay part provided in a pre-stage of the amplitude modulating part and a delay part provided in a pre-stage of the phase modulating part, respectively, adjusts the delay time of an amplitude signal path and a phase signal path.
TECHNICAL FIELD The present invention relates to a transmitter and more particularly to a transmitter including a high frequency power amplifier for amplifying a modulation signal having an envelope variable component with a low distortion and a high efficiency.
BACKGROUND ART For a power amplifier provided in an output part of the transmitter of a radio communication system, the compatibility of a low distortion and a high efficiency is required. The power amplifier has a classification that a transistor is used as a current source or a switch. The amplifier using the transistor as the current source includes an class A amplifier, an class AB amplifier, a class B amplifier and a class C amplifier. Further, the amplifier using the transistor as the switch includes a class D amplifier, an class E amplifier and an class F amplifier.
Si(t)=a(t)exp[j�(t)] (1),
amplitude data a(t) and phase data exp[j�(t)] are extracted from the Si(t) by the amplitude phase extracting part 112. The source voltage value of the non-linear amplifying part 115 is set by the amplitude modulating part 113 on the basis of the amplitude data a(t). On the other hand, a signal is generated by modulating carrier wave angular frequency ωc by the phase data exp[j�(t)]in the phase modulating part 114 to be Sc and Sc is inputted to the non-linear amplifying part 115.
Sc=exp[ωct+�(t)] (2)
Srf=Ga(t)Sc=Ga(t)exp[ωct+�(t)] (3)
(Non-Patent Document 1) Peter B. Keningstopm, �HIGH-LINEARITY RF AMPLIFIER DESIGN� first edition, ARTECH HOUSE, INC., 2000, p 426�443 (Non-Patent Document 2) R. A. Meyers and P. H. Waters, �Synthesizer review for PAN-European digital cellular radio� poc. IEE Colloquium on VLSI Implementations for 2nd Generation Digital Cordless and Mobile Telecommunications Systems, 1990, p. 8/1�8/8 (Non-Patent Document 3) Peter B. Kenington, �HIGH-LINEARITY RF AMPLIFIER DESIGN� first edition, ARTECH HOUSE, INC., 2000, p. 156�161 However, in the transmitter of the first usual example shown in FIG. 9, since an amplitude signal and a phase signal reach the non-linear amplifying part 115 through different paths, an output signal is undesirably distorted due to the difference of delay time between the signal path of an amplitude modulation and the signal path of a phase modulation.
DISCLOSURE OF THE INVENTION A transmitter according to the present invention comprises: an amplitude phase extracting unit for extracting amplitude data and phase data from inputted transmit data; a delay unit for delaying at least one of the amplitude data and the phase data; a phase modulating unit for modulating the phase of the phase data; a high frequency amplifying unit for using a phase modulating signal from the phase modulating unit as an input signal to amplify the power of a high frequency signal; and an amplitude modulating unit for modulating the amplitude of the amplitude data to output an amplitude modulating signal for controlling source voltage applied to the high frequency amplifying unit.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the structure of main parts of a transmitter according to a first embodiment of the present invention.
INDUSTRIAL APPLICABILITY As described above, according to the present invention, the transmitter having a good power efficiency and capable of outputting a stable signal with little distortion can be provided.
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2012Samsung Electronics Co., Ltd.Apparatus and method for power amplification with delay control in wireless communication systemUS816924820 mars 20111 mai 2012Mediatek Inc.Signal processing circuit and signal processing methodUS8379758 *10 sept. 201019 f�vr. 2013Mitsubishi Denki Kabushiki KaishaPower supply apparatus and power supply methodUS20100329385 *10 sept. 201030 d�c. 2010Noriharu SuematsuPower supply apparatus and power supply methodUS20110319034 *28 juin 201029 d�c. 2011Boe Eric NMethod and system for propagation time measurement and calibration using mutual coupling in a radio frequency transmit/receive system* Cit� par l'examinateurClassifications Classification aux �tats-Unis455/91, 455/95, 375/300, 375/302, 455/127.1, 455/127.2 Classification internationaleH03F1/32, H04B1/04, H04B1/02, H03F3/24, H03F1/02 Classification coop�rativeH03F3/24, H03F1/0222, H04B1/0475, H03F2200/331, H03F1/32, H03F1/3282 Classification europ�enneH03F1/32, H04B1/04L, H03F1/32P12, H03F1/02T1C1, H03F3/24�v�nements juridiques DateCode�v�nementDescription30 sept. 2010FPAYFee paymentYear of fee payment: 412 avr. 2005ASAssignmentOwner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARAYASHIKI, MAMORU;REEL/FRAME:016928/0543Effective date: 20050217Faire pivoterImage d'origineAccueil Google - Plan du site - T�l�chargements par lot sur l'USPTO - R�gles de confidentialit� - Conditions d'utilisation - � propos de Google�Brevets - Envoyer des commentairesDonn�es fournies par IFI CLAIMS Patent Services©2012 Google