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    • 4. 发明公开
    • Clock re-timing apparatus with cascaded delay stages
    • Vorrichtung zur Taktsignalsynchronisierung mittels kaskadierterVerzögerungsstufen
    • EP0771105A3
    • 1999-06-09
    • EP96116666.7
    • 1996-10-17
    • THOMSON CONSUMER ELECTRONICS, INC.
    • Rumreich, Mark FrancisGyurek, John William
    • H04N5/073
    • H03L7/00H03K5/15046H04N5/04H04N5/45
    • A video clock input signal (MCK) is applied to a delay line (30) comprising a cascade connection of a plurality (T1-T19) of delay elements for providing a plurality of delayed clock signals at respective taps (T1-T15) of the delay line. A selection circuit (6), responsive to a horizontal synchronizing signal (HS) supplied thereto, couples a selected one of the taps to an output for providing a delayed output clock signal (YCK) that is edge-aligned with the synchronizing signal (HS). For reducing the number of taps required to provide a given minimum delay step resolution and a given minimum total delay for delay elements which may vary in delay, from one integrated circuit to another, the taps are spaced one element apart for a first group (T1-T13) of the delay elements and are spaced more than one element apart for at least one (T13-T16; T17-T18; T19) second group of the elements.
    • 视频时钟输入信号(MCK)被施加到包括多个(T1-T19)延迟元件的级联连接的延迟线(30),用于在相应的抽头(T1-T15)上提供多个延迟的时钟信号 延迟线。 选择电路(6)响应于提供给其的水平同步信号(HS),将选择的一个抽头耦合到输出端,以提供与同步信号(HS)边缘对准的延迟输出时钟信号(YCK) )。 为了减少提供给定的最小延迟步长分辨率所需的抽头数量以及延迟元件给定的最小总延迟数,这些延迟元件可能随时间而变化,从一个集成电路到另一个集成电路,对于第一组(T1 -T13),并且对于至少一个(T13-T16; T17-T18; T19)第二组元件而间隔多于一个元件。