SE506694C2 - Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering - Google Patents

Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering

Info

Publication number
SE506694C2
SE506694C2 SE9404311A SE9404311A SE506694C2 SE 506694 C2 SE506694 C2 SE 506694C2 SE 9404311 A SE9404311 A SE 9404311A SE 9404311 A SE9404311 A SE 9404311A SE 506694 C2 SE506694 C2 SE 506694C2
Authority
SE
Sweden
Prior art keywords
code
generating
input code
digital
frequency
Prior art date
Application number
SE9404311A
Other languages
English (en)
Swedish (sv)
Other versions
SE9404311L (sv
SE9404311D0 (sv
Inventor
Lars Ingemar Erhage
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE9404311A priority Critical patent/SE506694C2/sv
Publication of SE9404311D0 publication Critical patent/SE9404311D0/xx
Priority to DE69525909T priority patent/DE69525909T2/de
Priority to EP95850215A priority patent/EP0717340B1/de
Priority to US08/570,513 priority patent/US5761101A/en
Publication of SE9404311L publication Critical patent/SE9404311L/
Publication of SE506694C2 publication Critical patent/SE506694C2/sv

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F1/0321—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers
    • G06F1/0328—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers in which the phase increment is adjustable, e.g. by using an adder-accumulator
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Amplitude Modulation (AREA)
SE9404311A 1994-12-12 1994-12-12 Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering SE506694C2 (sv)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9404311A SE506694C2 (sv) 1994-12-12 1994-12-12 Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering
DE69525909T DE69525909T2 (de) 1994-12-12 1995-12-05 Einrichtung und Verfahren zur Frequenzerzeugung
EP95850215A EP0717340B1 (de) 1994-12-12 1995-12-05 Einrichtung und Verfahren zur Frequenzerzeugung
US08/570,513 US5761101A (en) 1994-12-12 1995-12-11 Device and method for frequency generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9404311A SE506694C2 (sv) 1994-12-12 1994-12-12 Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering

Publications (3)

Publication Number Publication Date
SE9404311D0 SE9404311D0 (sv) 1994-12-12
SE9404311L SE9404311L (sv) 1996-06-13
SE506694C2 true SE506694C2 (sv) 1998-02-02

Family

ID=20396297

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9404311A SE506694C2 (sv) 1994-12-12 1994-12-12 Anordning och förfarande för reducering av oönskade frekvenskomponenter vid digital frekvensgenerering

Country Status (4)

Country Link
US (1) US5761101A (de)
EP (1) EP0717340B1 (de)
DE (1) DE69525909T2 (de)
SE (1) SE506694C2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6748408B1 (en) * 1999-10-21 2004-06-08 International Buisness Machines Corporation Programmable non-integer fractional divider
US6587863B1 (en) * 2000-06-27 2003-07-01 Analog Devices, Inc. Multiphase, interleaved direct digital synthesis methods and structures
US6779849B1 (en) * 2001-04-24 2004-08-24 The Lane Company, Inc. Multi-channel sling seat frame
GB2449461A (en) * 2007-05-23 2008-11-26 Agilent Technologies Inc Noise reduction in direct digital synthesis signal mixer by injecting then cancelling a pseudo noise component in the carrier wave
US20100194444A1 (en) * 2009-01-30 2010-08-05 Agilent Technolgies, Inc Reduction of spurious frequency components in direct digital synthesis

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890248A (en) * 1987-06-01 1989-12-26 Hughes Aircraft Company Method and apparatus for reducing aliasing in signal processing
US5014231A (en) * 1987-11-23 1991-05-07 Hughes Aircraft Company Randomized digital/analog converter direct digital synthesizer
US4901265A (en) * 1987-12-14 1990-02-13 Qualcomm, Inc. Pseudorandom dither for frequency synthesis noise
US4951237A (en) * 1988-04-22 1990-08-21 Hughes Aircraft Company Direct digital synthesizer with selectably randomized accumulator
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

Also Published As

Publication number Publication date
US5761101A (en) 1998-06-02
SE9404311L (sv) 1996-06-13
SE9404311D0 (sv) 1994-12-12
EP0717340A1 (de) 1996-06-19
EP0717340B1 (de) 2002-03-20
DE69525909D1 (de) 2002-04-25
DE69525909T2 (de) 2002-11-07

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Legal Events

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