Delay locked loop having a mis-lock detecting circuit

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6259290
SERIAL NO

09332899

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A delay locked loop has a voltage-controlled delay section and a mis-lock detecting circuit. The voltage-controlled delay sections comprises a plurality of controlled delay circuits, including a specific one. In the mis-lock detecting circuit, there are generated pulse signals, each having a pulse width equivalent to the delay time between the delayed signals output from the adjacent two of the controlled delay circuits preceding the specific controlled delayed circuit. Another pulse signal is generated, which has a pulse width equivalent to the delay time between the delayed signals output from adjacent two of the specific controlled delay circuit and the other controlled delay circuits following the specific one. These pulse signals are added, generating a pulse signal. The number of pulses this pulse signal has per a unit time is compared with the number of pulses a reference signal has per the unit time, thereby detecting whether the delay locked loop is normally locked or not.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
KABUSHIKI KAISHA TOSHIBATOKYO20986

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takada, Shuichi Kawasaki, JP 32 253
Yoshizawa, Akihiko Yokohama, JP 26 330

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SANYO ELECTRIC CO., LTD. (1)
* 5005079 Automatic frequency control circuit 10 1990
 
XEROX CORPORATION (1)
5223755 Extended frequency range variable delay locked loop for clock synchronization 164 1990
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
LATTICE SEMICONDUCTOR CORPORATION (1)
* 6970047 Programmable lock detector and corrector 12 2003
 
NEWPORT COMMUNICATIONS (1)
* 6760394 CMOS lock detect with double protection 6 2000
 
SAMSUNG ELECTRONICS CO., LTD. (2)
* 7508245 Lock detector and delay-locked loop having the same 2 2006
* 2007/0035,337 Lock detector and delay-locked loop having the same 3 2006
 
SK HYNIX INC. (2)
* 8749281 Phase detection circuit and synchronization circuit using the same 1 2012
* 2014/0002,150 PHASE DETECTION CIRCUIT AND SYNCHRONIZATION CIRCUIT USING THE SAME 4 2012
 
HITTITE MICROWAVE LLC (1)
* 9559703 System ready in a clock distribution chip 0 2015
 
SILICON LABORATORIES INC. (2)
* 7733138 False lock detection mechanism for use in a delay locked loop circuit 11 2005
* 2007/0057,708 False lock detection mechanism for use in a delay locked loop circuit 6 2005
 
MACOM CONNECTIVITY SOLUTIONS, LLC (1)
* 6581165 System for asynchronously transferring timed data using first and second clock signals for reading and writing respectively when both clock signals maintaining predetermined phase offset 10 2000
 
SOCIONEXT INC. (1)
* 9124416 Method for determining phase of clock used for reception of parallel data, receiving circuit, and electronic apparatus 0 2014
 
RENESAS ELECTRONICS CORPORATION (9)
* 6791385 Clock controlling method and circuit 1 2001
6794944 Lock detection circuit 15 2002
* 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
6900680 Clock controlling method and circuit 0 2004
* 6847243 Clock controlling method and circuit 0 2004
 
ALCATEL (2)
7154305 Periodic electrical signal frequency monitoring systems and methods 11 2004
* 2006/0132,190 Periodic electrical signal frequency monitoring systems and methods 7 2004
 
KABUSHIKI KAISHA TOSHIBA (2)
8704565 Lock detection circuit, DLL circuit, and receiving circuit 1 2012
9077352 Clock regeneration circuit, light receiving circuit, photocoupler, and frequency synthesizer 1 2013
 
Fujitsu Quantum Devices Limited (1)
* 6944252 Phase comparator circuit 4 2001
 
HYNIX SEMICONDUCTOR INC. (1)
* 7099232 Delay locked loop device 5 2004
 
AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (3)
6909762 Phase-locked loop circuit 2 2004
* 2004/0208,273 CMOS lock detect with double protection 0 2004
* 7103130 Phase-locked loop circuit 3 2005
 
CANON KABUSHIKI KAISHA (4)
7019573 DLL circuit and camcorder using DLL circuit 7 2004
* 2004/0239,389 DLL circuit and camcorder using DLL circuit 3 2004
RE43201 DLL circuit and camcorder using DLL circuit 0 2008
RE44029 DLL circuit and camcorder using DLL circuit 0 2010
* Cited By Examiner