US Patent No: 7,456,670

Number of patents in Portfolio can not be more than 2000

Distributed delay-locked-based clock and data recovery systems

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Abstract

A clock and data recovery system using a distributed variable delay line is provided. The clock and data recovery system can use a delay-locked loop methodology to align a local clock with an incoming data stream. The variable delay line can include a transmission line coupled with a plurality of variable capacitors responsive to a control voltage. The variable delay line can also have a ladder configuration of multiple LC subcircuits each having a variable impedance responsive to a control voltage.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
THE REGENTS OF THE UNIVERSITY OF CALIFORNIAOAKLAND, CA7204

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Heydari, Payam Irvine, CA 16 37
Mahanavelu, Ravindran Terrance, CA 2 8

Cited Art

Patent Info (Count) # Cites Year
 
LSI LOGIC CORPORATION (3)
5,953,386 High speed clock recovery circuit using complimentary dividers 58 1996
5,987,085 Clock recovery circuit 42 1997
6,008,680 Continuously adjustable delay-locked loop 30 1997
 
APPLIED MICRO CIRCUITS CORPORATION (2)
6,771,728 Half-rate phase detector with reduced timing requirements 12 2000
7,103,131 System and method for half-rate clock phase detection 3 2002
 
FUJITSU LIMITED (2)
5,610,954 Clock reproduction circuit and elements used in the same 27 1995
6,064,236 Phase detector and timing extracting circuit using phase detector 18 1998
 
SUN MICROSYSTEMS, INC. (2)
5,799,048 Phase detector for clock synchronization and recovery 43 1996
6,028,903 Delay lock loop with transition recycling for clock recovery of NRZ run-length encoded serial data signals 19 1997
 
ALLIANCE SEMICONDUCTOR CORPORATION (1)
7,027,548 Delay settings for a wide-range, high-precision delay-locked loop and a delay locked loop implementation using these settings 9 2001
 
ANALOG DEVICES, INC. (1)
5,629,652 Band-switchable, low-noise voltage controlled oscillator (VCO) for use with low-q resonator elements 49 1996
 
AVAGO TECHNOLOGIES GENERAL IP PTE. LTD. (1)
6,686,777 Phase detector having improved timing margins 11 2002
 
BROADCOM CORPORATION (1)
7,016,613 Linear half-rate phase detector and clock and data recovery circuit 7 2004
 
CYPRESS SEMICONDUCTOR CORPORATION (1)
6,690,243 Multi-phase voltage-controlled oscillator at modulated, operating frequency 21 2001
 
FORMFACTOR, INC. (1)
6,816,031 Adjustable delay transmission line 68 2001
 
GRASS VALLEY (US) INC. (1)
5,164,966 NRZ clock and data recovery system employing phase lock loop 33 1991
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
5,912,596 Apparatus and method for frequency tuning an LC oscillator in a integrated clock circuit 30 1998
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
4,984,255 Edge transition insensitive delay line system and method 63 1989
 
OKI ELECTRIC INDUSTRY CO., LTD. (1)
6,166,572 Voltage-controlled delay line, direct phase controlled voltage-controlled oscillator, clock/data recovery circuit, and clock/data recovery apparatus 65 1998
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,130,564 Signal delay circuit for minimizing the delay time dependence on power supply voltage variation 27 1990
 
TEKTRONIX, INC. (1)
4,701,714 Tunable delay line 20 1986
 
TEXAS INSTRUMENTS INCORPORATED (1)
2004/0036,541 Differential CMOS latch and digital quadrature LO generator using same 7 2002
 
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (1)
7,057,435 Distributed delay-locked-based clock and data recovery systems 6 2004

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
ANALOGIES SA (1)
8,149,066 Integrated circuit distributed oscillator 0 2007
 
SUN MICROSYSTEMS, INC. (1)
8,179,208 Interconnect for surfing circuits 0 2008

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
7.5 Year Payment $3600.00 $1800.00 $900.00 May 25, 2016
11.5 Year Payment $7400.00 $3700.00 $1850.00 May 25, 2020
Fee Large entity fee small entity fee micro entity fee
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00