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    • 9. 发明专利
    • Frequency-multiplying delay locked loop
    • 频率延迟延迟锁定环
    • JP2011019281A
    • 2011-01-27
    • JP2010210865
    • 2010-09-21
    • Mosaid Technol Incモーセッド・テクノロジーズ・インコーポレイテッドMosaid Technologies 1ncorporated
    • DEMONE PAUL W
    • G11C11/407H03K5/00G06F1/08H03K5/133H03K5/135H03K5/15H03L7/07H03L7/08H03L7/081H03L7/16
    • H03L7/06H03K5/00006H03K5/15046H03L7/07H03L7/0812H03L7/0814H03L7/089H03L7/16
    • PROBLEM TO BE SOLVED: To provide a frequency multiplier circuit which can generate an interface clock or an internal clock serving as a multiple of an external clock.SOLUTION: The frequency multiplier circuit (100) includes a delay line and a clock combining circuit (TOG). The delay line receives at one end thereof a reference clock (102) and generates clock tap outputs from a plurality of period matched delay elements (101). The clock combining circuit (TOG) is responsive to pairs of tap outputs and generates a rising and falling edge of an output clock pulse from the respective tap outputs. An output clock period is shorter than an input clock period. The delay line may be included in a delay-locked loop so as to match the period of the delay elements (101). Further, a plurality of combining circuit cells (TOG) are provided, each having inputs respectively coupled to ones of a predetermined number of delay stage tap outputs and providing complementary outputs. A selector (106) selects an output from one of a pair of complementary outputs of one of the combining cells in response to a selection control signal from a phase detector (112).
    • 要解决的问题:提供一种可产生接口时钟或内部时钟作为外部时钟的倍数的倍频电路。解码器:倍频电路(100)包括延迟线和时钟组合电路(TOG )。 延迟线在其一端接收参考时钟(102),并从多个周期匹配延迟元件(101)产生时钟抽头输出。 时钟组合电路(TOG)响应于抽头输出对,并从各个抽头输出产生输出时钟脉冲的上升沿和下降沿。 输出时钟周期短于输入时钟周期。 延迟线可以包括在延迟锁定环路中,以便与延迟元件(101)的周期相匹配。 此外,提供了多个组合电路单元(TOG),每个组合电路单元具有分别耦合到预定数量的延迟级抽头输出中的一些并提供互补输出的输入。 响应于来自相位检测器(112)的选择控制信号,选择器(106)从组合单元之一的一对互补输出中的一个选择输出。