Frequency synthesizer which suppresses a spurious

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5801589
SERIAL NO

08781519

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A variable divider in which a dividing number setting parameter can be set is provided in a reference oscillator. When a frequency setting parameter is selected so that a DDS will not output a spurious at a specified level or at a level higher than the specified level within an output band of an PLL in response to an output frequency from the PLL, both a conversion function setting parameter for a variable divider in the PLL and a dividing number setting parameter for a variable divider in the reference oscillator are adjusted so that the output frequency and the selected frequency setting parameter are satisfied.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MITSUBISHI DENKI KABUSHIKI KAISHATOKYO5930

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Doi, Masayuki Tokyo, JP 36 271
Iida, Akio Tokyo, JP 21 281
Itoh, Kenji Tokyo, JP 130 1996
Nishimura, Shuji Tokyo, JP 4 88
Tajima, Kenichi Tokyo, JP 29 303

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 4965553 Hand-near-mouth warning device 27 1989
 
NEC CORPORATION (2)
* 5270669 Local oscillating frequency synthesizer for use in a TDMA system 26 1992
* 5497128 Local oscillator system and frequency switching method for minimizing spurious components 13 1993
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
* 5184093 Frequency synthesizer 30 1992
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (2)
* 7171182 Frequency synthesizers for supporting voice communication and wireless networking standards 4 2002
* 2004/0198,256 Frequency synthesizers for supporting voice communication and wireless networking standards 2 2002
 
BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. (1)
* 9461636 Techniques for enhancing spurious free dynamic range performance 0 2015
 
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) (2)
7570123 Digitally controlled analog frequency synthesizer 1 2006
* 2008/0157,881 Digitally Controlled Analog Frequency Synthesizer 4 2006
 
BLACKBERRY LIMITED (1)
* 6483388 Direct digital frequency synthesizer and a hybrid frequency synthesizer combining a direct digital frequency synthesizer and a phase locked loop 25 2001
 
NOKIA TECHNOLOGIES OY (1)
* 6239660 Step-controlled frequency synthesizer 5 2000
 
MSTAR SEMICONDUCTOR, INC. (2)
* 8150349 Apparatus and method for audio conversion 0 2008
* 2011/0116,655 Apparatus and Method for Audio Conversion 2 2008
 
FUJITSU LIMITED (1)
* 2009/0295,490 DDS CIRCUIT AND ELECTRONIC DEVICE HAVING THE SAME 1 2009
 
MERCURY SYSTEMS, INC. (2)
7302237 Wideband signal generators, measurement devices, methods of signal generation, and methods of signal analysis 15 2004
* 2005/0003,785 Wideband signal generators, measurement devices, methods of signal generation, and methods of signal analysis 17 2004
 
INTEL CORPORATION (1)
* 6707343 Frequency synthesis apparatus, systems, and methods 1 2003
 
RENESAS ELECTRONICS CORPORATION (8)
6791385 Clock controlling method and circuit 1 2001
* 2002/0021,153 Clock controlling method and circuit 4 2001
6791386 Clock controlling method and circuit with a multi-phase multiplication clock generating circuit 1 2003
7034592 Clock controlling method and circuit 3 2004
6965259 Clock controlling method and circuit 2 2004
6900680 Clock controlling method and circuit 0 2004
6847243 Clock controlling method and circuit 0 2004
* 2004/0217,786 Clock controlling method and circuit 0 2004
 
TEXAS INSTRUMENTS INCORPORATED (3)
* 8385476 Digital phase locked loop 0 2002
* 2002/0191,727 Digital phase locked loop 30 2002
8742808 Digital phase locked loop 1 2012
 
HARRIS CORPORATION (1)
6522177 Frequency synthesis device 13 2000
 
AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (14)
* 8284822 Method and system for utilizing direct digital frequency synthesis to process signals in multi-band applications 1 2007
* 7826550 Method and system for a high-precision frequency generator using a direct digital frequency synthesizer for transmitters and receivers 5 2007
* 2008/0205,550 Method and System for Using a Phase Locked Loop for Upconversion in a Wideband Polar Transmitter 5 2007
* 2008/0205,545 Method and System for Using a Phase Locked Loop for Upconversion in a Wideband Crystalless Polar Transmitter 2 2007
* 2008/0205,543 Method and System for a High-Precision Frequency Generator using a Direct Digital Frequency Synthesizer for Transmitters and Receivers 2 2007
* 8116387 Method and system for a digital polar transmitter 1 2007
* 2008/0212,707 METHOD AND SYSTEM FOR A DIGITAL POLAR TRANSMITTER 3 2007
* 8085877 Method and system for quadrature local oscillator generator utilizing a DDFS for extremely high frequencies 8 2007
* 2009/0086,796 Method And System For A High Frequency Signal Repeater Using A DDFS 4 2007
* 2009/0086,851 Method And System For Quadrature Local Oscillator Generator Utilizing A DDFS For Extremely High Frequencies 16 2007
* 2009/0086,844 Method And System For A Programmable Local Oscillator Generator Utilizing A DDFS For Extremely High Frequencies 24 2007
* 7916804 Method and system for a fast-switching phase-locked loop using a direct digital frequency synthesizer 0 2009
* 8848831 Direct digital synthesis of quadrature modulated signals 0 2012
* 2014/0079,154 DIRECT DIGITAL SYNTHESIS OF QUADRATURE MODULATED SIGNALS 0 2012
 
ADVANTECH WIRELESS LTD. (1)
* 6493410 Wide band high resolution synthesizer 7 1999
* Cited By Examiner