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    • 27. 发明授权
    • Clock pulse generator
    • 时钟脉冲发生器
    • US5936441A
    • 1999-08-10
    • US857202
    • 1997-05-15
    • Kozaburo Kurita
    • Kozaburo Kurita
    • H03K3/0231H03K3/03H03K3/354H03K5/13H03L7/07H03L7/081H03L7/099H03L7/10H03L7/00
    • H03L7/0805H03K3/0231H03K3/03H03K3/0322H03K5/133H03L7/07H03L7/0812H03L7/0995
    • A simply structured clock pulse generator operating stably in a wide range of frequencies in response to a timing signal fed from outside a semiconductor integrated circuit. A first frequency signal fed from the external terminal of the semiconductor integrated circuit and a second frequency signal generated within the semiconductor integrated circuit are input to a phase comparator. The output signal of the phase comparator is smoothed by a low-pass filter for conversion to a voltage signal. A compensation circuit uses both a delay signal from a current-controlled delay circuit receiving the first frequency signal and the first frequency signal to generate a current signal corresponding to the frequency of the latter signal. The voltage signal generated by the low-pass filter is converted into a current signal. This current signal is combined with the current signal from the compensation circuit to control the oscillation frequency of a ring oscillator comprising a current-controlled delay circuit the same in structure as the above current-controlled delay circuit. On the basis of the oscillation signal from the ring oscillator, the second frequency signal and clock signals needed in the semiconductor integrated circuit are generated.
    • 响应于从半导体集成电路外部馈送的定时信号,在宽频率范围内稳定地运行的简单结构的时钟脉冲发生器。 从半导体集成电路的外部端子馈送的第一频率信号和在半导体集成电路内产生的第二频率信号被输入到相位比较器。 相位比较器的输出信号由低通滤波器平滑,用于转换为电压信号。 补偿电路使用来自接收第一频率信号的电流控制延迟电路的延迟信号和第一频率信号来产生对应于后一信号的频率的电流信号。 由低通滤波器产生的电压信号被转换为电流信号。 该电流信号与来自补偿电路的电流信号组合,以控制包括与上述电流控制延迟电路相同结构的电流控制延迟电路的环形振荡器的振荡频率。 基于来自环形振荡器的振荡信号,生成半导体集成电路中所需的第二频率信号和时钟信号。