IL89846A - Direct digital synthesizer with selectably randomized accumulator - Google Patents
Direct digital synthesizer with selectably randomized accumulatorInfo
- 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
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)
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 (xx) |
EP (1) | EP0338742B1 (xx) |
JP (1) | JP2659022B2 (xx) |
IL (1) | IL89846A (xx) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69011670T2 (de) * | 1990-05-02 | 1994-12-08 | Hewlett Packard Ltd | Frequenzsynthesizer. |
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 (de) * | 1999-03-11 | 2000-09-14 | Siemens Aktiengesellschaft | Verfahren zum erzeugen eines signals mit einstellbarer frequenz durch einen zittersignalgenerator |
WO2001008311A1 (de) * | 1999-07-21 | 2001-02-01 | Siemens Aktiengesellschaft | Taktsignalgenerator |
WO2001018637A1 (de) * | 1999-09-02 | 2001-03-15 | Siemens Aktiengesellschaft | Verbesserung der spektralen eigenschaften bei einer direkten digitalen frequenzsynthese |
US6353649B1 (en) * | 2000-06-02 | 2002-03-05 | Motorola, Inc. | Time interpolating direct digital synthesizer |
EP1351397A3 (en) * | 2001-11-27 | 2005-03-02 | Texas Instruments Incorporated | All-digital frequency synthesis with capacitive re-introduction of dithered tuning information |
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 |
CA2547688A1 (en) * | 2003-12-11 | 2005-07-14 | Advanced Radio Corporation | Wideband dds synthesizer |
WO2004082146A2 (en) * | 2004-02-10 | 2004-09-23 | Raytheon Company | Digital-phase to digital amplitude translator with first bit off priority coded output for input to unit weighed digital to analog converter |
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 (en) * | 2005-05-10 | 2018-08-15 | Texas Instruments Incorporated | Fast hopping frequency synthesizer using an all digital phased locked loop (adpll) |
US7599977B2 (en) * | 2005-08-16 | 2009-10-06 | Reveal Imaging, Llc | Direct digital synthesizer system and related methods |
US8542784B2 (en) * | 2011-06-22 | 2013-09-24 | Broadcom Corporation | Spur mitigation for radio frequency receivers utilizing a free-running crystal |
US8594251B2 (en) | 2011-06-22 | 2013-11-26 | Broadcom Corporation | Long-term drift mitigation for radio frequency receivers utilizing a free-running crystal |
CN107430413A (zh) * | 2014-12-31 | 2017-12-01 | 信芯高技电子美国公司 | 时钟生成器和处理器系统 |
Family Cites Families (7)
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 |
-
1988
- 1988-04-22 US US07/184,642 patent/US4951237A/en not_active Expired - Lifetime
-
1989
- 1989-04-04 IL IL89846A patent/IL89846A/xx not_active IP Right Cessation
- 1989-04-17 EP EP89303760A patent/EP0338742B1/en not_active Expired - Lifetime
- 1989-04-21 JP JP1103307A patent/JP2659022B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0338742B1 (en) | 1995-01-04 |
US4951237A (en) | 1990-08-21 |
JPH0263305A (ja) | 1990-03-02 |
EP0338742A2 (en) | 1989-10-25 |
EP0338742A3 (en) | 1991-10-30 |
JP2659022B2 (ja) | 1997-09-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
IL89846A (en) | Direct digital synthesizer with selectably randomized accumulator | |
EP0338806A3 (en) | Syringes | |
GB2276053B (en) | Direct digital synthesizer | |
HUT59017A (en) | Injection syringe | |
HUT50715A (en) | Barrel | |
AU105442S (en) | Parts Bin | |
GB8915950D0 (en) | Liquid-crystalline mixtures | |
GB8925641D0 (en) | Direct digital synthesizer | |
GB2220635B (en) | Barrel | |
GB2219487B (en) | Bin | |
GB8807745D0 (en) | Storage unit | |
AU104591S (en) | Lock barrel | |
AU104583S (en) | Lock barrel | |
AU104579S (en) | Lock barrel | |
AU104592S (en) | Lock barrel | |
AU104589S (en) | Lock barrel | |
AU104581S (en) | Lock barrel | |
AU104585S (en) | Lock barrel | |
AU104593S (en) | Lock barrel | |
AU104587S (en) | Lock barrel | |
AU104588S (en) | Lock barrel | |
AU104584S (en) | Lock barrel | |
AU104590S (en) | Lock barrel | |
AU104580S (en) | Lock barrel | |
AU104578S (en) | Lock barrel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
KB | Patent renewed | ||
RH1 | Patent not in force |