Multi-phase modulator having automatic compensators for offsets of orthogonal adjustment

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6014065
SERIAL NO

09040449

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A multi-phase modulator for modulating n digital data into a 2.sup.n digital phase modulated signal includes digital-analog convertors for converting the digital data into analog signals, automatic gain compensators for controlling output levels of the analog signals, binary phase modulators for modulating the analog signals, a 90-degree phase shifter operatively connected to the binary phase modulators for providing modulated signals, the modulated signals being phase shifted from one another by 90-degrees, and offset compensators for compensating and adjusting offsets of orthogonal adjustment by automatic control, the offset compensators including DC offset compensators for controlling DC voltages of the digital-analog convertors, gain offset compensators for controlling gains of the automatic gain compensators, and a phase offset compensator for controlling phases of the modulated signals provided by the 90-degree phase shifter and input to the binary phase modulators.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NEC CORPORATIONTOKYO10615

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nishikawa, Makoto Tokyo, JP 25 153

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ALCATEL TELSPACE (1)
* 5663691 Estimator for estimating an operating defect in a quadrature modulator, and a modulation stage using the estimator 11 1996
 
NOKIA MOBILE PHONES LTD. (1)
* 5371481 Tuning techniques for I/Q channel signals in microwave digital transmission systems 51 1993
 
NEC ELECTRONICS CORPORATION (1)
* 5355101 Quadrature modulator having circuit for correcting phase error 19 1992
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (1)
* 6181099 Method and apparatus for correcting DC offset in a frequency to voltage converter and motor drive using the same 6 1999
 
ALPS ELECTRIC CO., LTD. (1)
* 6683917 Base band signal processing circuit capable of improving both noise characteristic and distortion characteristic 1 1999
 
ALESIS SEMICONDUCTOR, INC. (1)
* 6163197 Low noise method for interconnecting analog and digital integrated circuits 0 1999
 
RENESAS ELECTRONICS CORPORATION (8)
* 6791385 Clock controlling method and circuit 1 2001
* 6888387 Clock controlling method and circuit 3 2003
* 6791386 Clock controlling method and circuit with a multi-phase multiplication clock generating circuit 1 2003
* 2003/0122,596 Clock controlling method and circuit 0 2003
7034592 Clock controlling method and circuit 3 2004
* 6965259 Clock controlling method and circuit 2 2004
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NOKIA TECHNOLOGIES OY (2)
6947710 Transmitter 2 2002
* 2003/0003,882 Transmitter 1 2002
 
GOOGLE TECHNOLOGY HOLDINGS LLC (1)
* 7030795 Digital automatic gain control method and device 3 2005
 
PROVENANCE ASSET GROUP LLC (3)
* 6421397 Modulation system having on-line IQ calibration 16 2000
* 6421398 Modulation system having on-line IQ calibration 23 2000
6574286 Modulation system having on-line IQ calibration 18 2002
 
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* 2005/0002,361 Random access channel preamble detection 11 2004
8036180 Random access channel preamble 0 2009
* 2009/0245,220 RANDOM ACCESS CHANNEL PREAMBLE 2 2009
8218508 Random access channel preamble 0 2010
* 2010/0240,411 RANDOM ACCESS CHANNEL PREAMBLE 1 2010
8958397 Random access channel preamble 0 2012
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* Cited By Examiner