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    • 33. 发明专利
    • Phase-locked loop circuit and communication device
    • 相位锁定环路和通信设备
    • JP2011023804A
    • 2011-02-03
    • JP2009164725
    • 2009-07-13
    • Renesas Electronics Corpルネサスエレクトロニクス株式会社
    • UEDA KEISUKEUOZUMI TOSHIYAENDO RYO
    • H03L7/091H03L7/08
    • H03L7/085H03L7/0802H03L7/1077H03L7/18H03L2207/50
    • PROBLEM TO BE SOLVED: To provide a PLL (Phase-Locked Loop) circuit where low power consumption and miniaturization are both achieved. SOLUTION: A phase comparator 2 at the PLL circuit includes a counter 16 and a time digital converter 13. The counter 16 receives a reference clock signal REF, a low frequency clock signal CLKA, obtained by frequency division of the output of a digitally controlled oscillator, and a high frequency clock signal CLKB. The counter 16 counts the clock number of the high frequency clock signal CLKB to detect phase difference between the reference clock signal REF and the low frequency clock signal CLKA. The time digital converter 13 receives the reference clock signal REF and the low frequency clock signal CLKA. The time digital converter 13 detects the phase difference between the reference clock signal REF and the low frequency clock signal CLKA in accuracy of a time period shorter than the period of the high frequency clock signal CLKB, after the output of the counter 16 enters into a predetermined range. COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提供两个实现低功耗和小型化的PLL(锁相环)电路。 解决方案:PLL电路的相位比较器2包括一个计数器16和一个时间数字转换器13.计数器16接收一个参考时钟信号REF,一个低频时钟信号CLKA,通过对一个 数字控制振荡器和高频时钟信号CLKB。 计数器16对高频时钟信号CLKB的时钟数进行计数,以检测参考时钟信号REF和低频时钟信号CLKA之间的相位差。 时间数字转换器13接收参考时钟信号REF和低频时钟信号CLKA。 时间数字转换器13在计数器16的输出进入其中之后,在比高频时钟信号CLKB的周期更短的时间周期内精确地检测参考时钟信号REF和低频时钟信号CLKA之间的相位差 预定范围。 版权所有(C)2011,JPO&INPIT