US Patent No: 5,719,514

Number of patents in Portfolio can not be more than 2000

Delay circuit compensating for variations in delay time

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Abstract

A variable delay circuit is provided which automatically compensates for variations in delay time due to manufacturing variables. The construction is such that with variable delay gates (VD) of a reference delay time generation circuit (21), the delay time for one cycle of a designed reference clock signal (CK) is compensated using a phase comparison device (22) and a low pass filter (23). By arranging the reference delay time generation circuit (21) proximately to paths (121-124 and 141-144) which are weighted with the same variable delay gates (VD) as in the reference delay time generation circuit (21), the reference delay time generation circuit (21) and the paths (121-124 and 141-144) are given the same extent of variation. Hence variations in delay time can be compensated for using the same control signal CTR.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
YOKOGAWA ELECTRIC CORPORATIONTOKYO891

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Sato, Yu Hachioji, JP 20 73

Cited Art

Patent Info (Count) # Cites Year
 
BROOKTREE BROADBAND HOLDING, INC. (1)
5,338,990 Regulated delay line 7 1993
 
FUJITSU SEMICONDUCTOR LIMITED (1)
5,216,302 Reference delay generator and electronic device using the same 65 1991
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
5,008,629 Frequency synthesizer 21 1989
 
MOTOROLA, INC. (1)
4,893,087 Low voltage and low power frequency synthesizer 94 1988
 
NORTEL NETWORKS LIMITED (1)
5,146,121 Signal delay apparatus employing a phase locked loop 54 1991
 
NXP B.V. (1)
5,252,867 Self-compensating digital delay semiconductor device with selectable output delays and method therefor 31 1992
 
RENESAS ELECTRONICS CORPORATION (1)
5,428,309 Delay circuit 55 1993
 
STANDARD MICROSYSTEMS CORPORATION (1)
4,899,071 Active delay line circuit 52 1988
 
WESTERN DIGITAL TECHNOLOGIES, INC. (1)
4,922,141 Phase-locked loop delay line 184 1988
 
YAMAHA CORPORATION (1)
5,039,893 Signal delay device 64 1989
 
ZENITH ELECTRONICS CORPORATION (1)
5,105,108 Delay circuit with phase locked loop control 18 1990

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HITTITE MICROWAVE CORPORATION (2)
7,659,707 RF detector with crest factor measurement 3 2008
7,944,196 RF detector with crest factor measurement 1 2009
 
LSI LOGIC CORPORATION (2)
6,028,462 Tunable delay for very high speed 13 1997
6,008,680 Continuously adjustable delay-locked loop 30 1997
 
RENESAS ELECTRONICS CORPORATION (2)
6,900,679 Digital phase control circuit 16 2002
7,752,420 Configuration layout number controlled adjustable delaying of connection path changes among processors in array to reduce transition glitches 0 2008
 
TEXAS INSTRUMENTS INCORPORATED (2)
8,207,764 Enhancement of power management using dynamic voltage and frequency scaling and digital phase lock loop high speed bypass mode 1 2009
8,278,980 Enhancement of power management using dynamic voltage and frequency scaling and digital phase lock loop high speed bypass mode 0 2012
 
WESTERN DIGITAL TECHNOLOGIES, INC. (2)
8,324,974 Regulating power consumption of digital circuitry using a multi-layer ring oscillator 1 2010
8,390,367 Ensuring minimum gate speed during startup of gate speed regulator 0 2011
 
XILINX, INC. (2)
6,204,710 Precision trim circuit for delay lines 44 1998
6,664,837 Delay line trim unit having consistent performance under varying process and temperature conditions 27 2002
 
ANALOG DEVICES, INC. (1)
6,242,959 Programmable delay circuit and method with dummy circuit compensation 5 1999
 
FREESCALE SEMICONDUCTOR, INC. (1)
6,366,157 Methods and circuits for dynamically adjusting a supply voltage and/or a frequency of a clock signal in a digital circuit 18 2000
 
FUJITSU LIMITED (1)
7,902,897 Variable delay circuit and delay correction method 0 2008
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
7,202,702 Output buffer slew rate control using clock signal 7 2003
 
INFINEON TECHNOLOGIES AG (1)
8,243,555 Apparatus and system with a time delay path and method for propagating a timing event 0 2008
 
INTEL CORPORATION (1)
6,346,842 Variable delay path circuit 5 1997
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
6,154,083 Ground bounce control using DLL to optimize output stage di/dt using output driver replica 12 1998
 
NOKIA CORPORATION (1)
6,914,472 Phase modulating system 0 2003
 
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
 
QUALCOMM INCORPORATED (1)
8,169,243 Techniques for non-overlapping clock generation 0 2009
 
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. (1)
7,446,587 Semiconductor device and driving method thereof 1 2004