IL89846A - Direct digital synthesizer with selectably randomized accumulator - Google Patents

Direct digital synthesizer with selectably randomized accumulator

Info

Publication number
IL89846A
IL89846A IL89846A IL8984689A IL89846A IL 89846 A IL89846 A IL 89846A IL 89846 A IL89846 A IL 89846A IL 8984689 A IL8984689 A IL 8984689A IL 89846 A IL89846 A IL 89846A
Authority
IL
Israel
Prior art keywords
selectably
randomized
accumulator
direct digital
digital synthesizer
Prior art date
Application number
IL89846A
Other languages
English (en)
Original Assignee
Hughes Aircraft Co
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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of IL89846A publication Critical patent/IL89846A/xx

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • G06F1/0353—Reduction of table size by using symmetrical properties of the function, e.g. using most significant bits for quadrant control
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/04—Trigonometric functions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/902—Spectral purity improvement for digital function generators by adding a dither signal, e.g. noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Analogue/Digital Conversion (AREA)
IL89846A 1988-04-22 1989-04-04 Direct digital synthesizer with selectably randomized accumulator IL89846A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/184,642 US4951237A (en) 1988-04-22 1988-04-22 Direct digital synthesizer with selectably randomized accumulator

Publications (1)

Publication Number Publication Date
IL89846A true IL89846A (en) 1992-07-15

Family

ID=22677744

Family Applications (1)

Application Number Title Priority Date Filing Date
IL89846A IL89846A (en) 1988-04-22 1989-04-04 Direct digital synthesizer with selectably randomized accumulator

Country Status (4)

Country Link
US (1) US4951237A (fr)
EP (1) EP0338742B1 (fr)
JP (1) JP2659022B2 (fr)
IL (1) IL89846A (fr)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454917B1 (fr) * 1990-05-02 1994-08-17 Hewlett-Packard Limited Synthétiseur de fréquences
US5386398A (en) * 1990-12-28 1995-01-31 Massachusetts Institute Of Technology Display of partly randomized time
JPH05218895A (ja) * 1992-01-31 1993-08-27 Nec Corp 受信装置
US5235613A (en) * 1992-03-02 1993-08-10 The Boeing Company Frequency hopping method and apparatus
US5329260A (en) * 1992-07-17 1994-07-12 Ii Morrow Inc. Numerically-controlled modulated oscillator and modulation method
US5305362A (en) * 1992-12-10 1994-04-19 Hewlett-Packard Company Spur reduction for multiple modulator based synthesis
JPH06224879A (ja) * 1993-01-22 1994-08-12 Mitsui Mining & Smelting Co Ltd スペクトラム拡散通信用送信機および該送信機用ｌｓｉ
JPH0763124B2 (ja) * 1993-02-24 1995-07-05 日本電気株式会社 直接デジタル周波数シンセサイザ
US5291428A (en) * 1993-03-02 1994-03-01 Harris Corporation Apparatus for reducing spurious frequency components in the output signal of a direct digital synthesizer
US5598437A (en) * 1993-07-16 1997-01-28 Litton Systems, Inc. Multichannel frequency and phase variable radio frequency simulator
DE4342520A1 (de) * 1993-12-14 1995-06-22 Forschungszentrum Juelich Gmbh Schmalbandiger arbiträrer HF-Modulations- und Rauschgenerator
US5467294A (en) * 1994-03-09 1995-11-14 Hu; Vince High speed, low power direct digital synthesizer
US5521533A (en) * 1994-09-16 1996-05-28 Rockwell International Apparatus and method for spurious signal reduction in direct-digital synthesizers
JP3268138B2 (ja) * 1994-09-29 2002-03-25 三菱電機株式会社 通信装置、周波数シンセサイザ及びシンセサイズ方法
US5598440A (en) * 1994-11-08 1997-01-28 Mpb Technologies Inc. DDS driven DDS synthesizer for generating sinewave waveforms with reduced spurious signal levels
SE506694C2 (sv) * 1994-12-12 1998-02-02 Ericsson Telefon Ab L M Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering
US5602874A (en) * 1994-12-29 1997-02-11 Motorola, Inc. Method and apparatus for reducing quantization noise
US5841808A (en) * 1995-03-23 1998-11-24 Mcdonnell Douglas Corporation Spread spectrum chip rate tracking system
US5691931A (en) * 1995-06-07 1997-11-25 Hitachi America, Ltd. Low power adder for accumulation
US5673212A (en) * 1995-09-01 1997-09-30 Motorola, Inc. Method and apparatus for numerically controlled oscillator with partitioned phase accumulator
GB9616537D0 (en) * 1996-08-06 1996-09-25 Digi Media Vision Ltd Digital synthesiser
US6748407B1 (en) * 1999-02-03 2004-06-08 Nec Corporation Direct digital synthesizer
WO2000054401A1 (fr) * 1999-03-11 2000-09-14 Siemens Aktiengesellschaft Procede pour generer un signal a une frequence reglable a l'aide d'un generateur de signaux de vibration
EP1198889B1 (fr) * 1999-07-21 2003-06-25 Siemens Aktiengesellschaft Generateur de signal d'horloge
WO2001018637A1 (fr) * 1999-09-02 2001-03-15 Siemens Aktiengesellschaft Amelioration des proprietes spectrales lors d'une synthese de frequences numerique directe
US6353649B1 (en) * 2000-06-02 2002-03-05 Motorola, Inc. Time interpolating direct digital synthesizer
EP1351397A3 (fr) * 2001-11-27 2005-03-02 Texas Instruments Incorporated Synthèse entièrement numérique de fréquence avec réintroduction capacitive d'informations d'accord à tremblement
US7302237B2 (en) * 2002-07-23 2007-11-27 Mercury Computer Systems, Inc. Wideband signal generators, measurement devices, methods of signal generation, and methods of signal analysis
US7282967B2 (en) 2003-10-30 2007-10-16 Avago Technologies General Ip ( Singapore) Pte. Ltd. Fixed frequency clock output having a variable high frequency input clock and an unrelated fixed frequency reference signal
JP2007525853A (ja) * 2003-12-11 2007-09-06 マーキュリー・コンピューター・システムズ・インコーポレイテッド 広帯域ダイレクト・ディジタル・シンセサイザ
WO2004082146A2 (fr) * 2004-02-10 2004-09-23 Raytheon Company Translateur de phase numerique a amplitude numerique avec sortie codee a priorite premier bit dans un convertisseur numerique-analogique a ponderation unitaire
US7023368B1 (en) * 2004-08-31 2006-04-04 Euvis, Inc. Digital-to-analog signal converting apparatus and method to extend usable spectrum over Nyquist frequency
EP1882304B1 (fr) * 2005-05-10 2018-08-15 Texas Instruments Incorporated Synthetiseur de frequence a sauts rapides, employant une boucle a verrouillage de phase entierement numerique (adpll)
US7599977B2 (en) * 2005-08-16 2009-10-06 Reveal Imaging, Llc Direct digital synthesizer system and related methods
US8594251B2 (en) 2011-06-22 2013-11-26 Broadcom Corporation Long-term drift mitigation for radio frequency receivers utilizing a free-running crystal
US8542784B2 (en) * 2011-06-22 2013-09-24 Broadcom Corporation Spur mitigation for radio frequency receivers utilizing a free-running crystal
JP2018506101A (ja) * 2014-12-31 2018-03-01 メガチップス テクノロジー アメリカ コーポレーション クロック発生器及びプロセッサシステム

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206425A (en) * 1978-08-29 1980-06-03 Rca Corporation Digitized frequency synthesizer
US4410954A (en) * 1980-10-08 1983-10-18 Rockwell International Corporation Digital frequency synthesizer with random jittering for reducing discrete spectral spurs
US4652832A (en) * 1985-07-05 1987-03-24 Motorola, Inc. Frequency resolution in a digital oscillator
US4752902A (en) * 1985-07-08 1988-06-21 Sciteq Electronics, Inc. Digital frequency synthesizer
US4815018A (en) * 1985-12-24 1989-03-21 Hughes Aircraft Company Spurless fractional divider direct digital frequency synthesizer and method
US4809205A (en) * 1986-11-19 1989-02-28 Rockwell International Corporation Digital sine conversion circuit for use in direct digital synthesizers
SU1584065A1 (ru) * 1988-05-23 1990-08-07 Предприятие П/Я Г-4149 Цифровой синтезатор частоты

Also Published As

Publication number Publication date
EP0338742A2 (fr) 1989-10-25
EP0338742A3 (fr) 1991-10-30
EP0338742B1 (fr) 1995-01-04
US4951237A (en) 1990-08-21
JPH0263305A (ja) 1990-03-02
JP2659022B2 (ja) 1997-09-30

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Legal Events

Date Code Title Description
KB Patent renewed
RH1 Patent not in force