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    • 8. 发明专利
    • Semiconductor integrated circuit
    • 半导体集成电路
    • JP2005115715A
    • 2005-04-28
    • JP2003350287
    • 2003-10-09
    • Renesas Technology Corp株式会社ルネサステクノロジ
    • OKUDA YUICHI
    • G06K19/077G06F1/08G06F13/42G06K17/00H03L7/07H03L7/091H03L7/23
    • H03L7/235G06F1/08H03L7/07H03L7/091
    • PROBLEM TO BE SOLVED: To self-oscillate at a required frequency by using a data string divided for every fixed cycle by a SOF (Start of Frame) packet or the like without using a vibrator. SOLUTION: A semiconductor integrated circuit has an external interface circuit, and the external interface circuit has a clock generation circuit (100) which inputs and outputs the data string divided for every fixed cycle and generates a synchronizing clock signal for use in synchronization of data input/output. The clock generation circuit has a self-oscillation circuit (120) being the oscillation source of the synchronizing clock signal and a control circuit (110) for finely adjusting the oscillation frequency of the self-oscillation circuit, and the control circuit detects delimitations of the fixed cycle in the data string and measures intervals of delimitations on the basis of the oscillation output of the self-oscillation circuit and controls the oscillation output of the self-oscillation circuit in such a direction that a measured value coincides with a target value. Thus self-oscillation at a required frequency is made possible by using a data string divided for every fixed cycle by the SOF packet or the like without using a vibrator. COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:通过使用通过SOF(起始帧)数据包等对每个固定周期分割的数据串而不使用振动器来以所需频率自振荡。 解决方案:半导体集成电路具有外部接口电路,并且外部接口电路具有时钟发生电路(100),其输入和输出每个固定周期划分的数据串,并产生用于同步的同步时钟信号 的数据输入/输出。 时钟发生电路具有作为同步时钟信号的振荡源的自身振荡电路(120)和用于微调自振荡电路的振荡频率的控制电路(110),并且控制电路检测到 固定循环,并根据自振荡电路的振荡输出测量间隔间隔,并以测量值与目标值一致的方向控制自振荡电路的振荡输出。 因此,通过使用通过SOF分组等对每个固定周期分割的数据串而不使用振动器,可以实现所需频率的自振荡。 版权所有(C)2005,JPO&NCIPI
    • 9. 发明专利
    • Clock generating circuit
    • 时钟发生电路
    • JP2005020083A
    • 2005-01-20
    • JP2003178416
    • 2003-06-23
    • Renesas Lsi Design CorpRenesas Technology Corp株式会社ルネサスLsiデザイン株式会社ルネサステクノロジ
    • ARAKI MASAHIROHAYASHI CHIEKO
    • G06F1/04H03K3/03H03K5/00H03K5/13H03L7/081H03L7/099H03L7/18H03L7/23H04L7/02
    • H03L7/0812H03L7/081H03L7/0996H03L7/23H03L7/235
    • PROBLEM TO BE SOLVED: To provide a spread spectrum clock generating circuit capable of conducting frequency modulation with high accuracy. SOLUTION: In the spread spectrum clock generating circuit, a DLL circuit 8 delays the oscillation clock signal CLKO from a VCO 7 and outputs delayed clock signals CLKD1 to CLKD10 having different phases respectively. A selector 9 selects one of the delayed clock signals CLKD1 to CLKD10, and outputs a selected clock signal CLKS. A control circuit 3 controls a signal selection operation of the selector 9. A feedback frequency divider 10 divides a frequency of the selected clock signal CLKS by a frequency division ratio N, and generates a comparison clock signal CLKC. In this manner, a phase of the comparison clock signal CLKC can be fine-tuned. Therefore, the spread spectrum clock generating circuit capable of conducting frequency modulation with high accuracy can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:提供能够以高精度进行频率调制的扩频时钟发生电路。 解扩:在扩频时钟发生电路中,DLL电路8将来自VCO7的振荡时钟信号CLKO延迟,分别输出具有不同相位的延迟时钟信号CLKD1〜CLKD10。 选择器9选择延迟时钟信号CLKD1至CLKD10中的一个,并输出所选择的时钟信号CLKS。 控制电路3控制选择器9的信号选择操作。反馈分频器10将选择的时钟信号CLKS的频率除以分频比N,并产生比较时钟信号CLKC。 以这种方式,可以微调比较时钟信号CLKC的相位。 因此,可以获得能够高精度地进行频率调制的扩频时钟发生电路。 版权所有(C)2005,JPO&NCIPI