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    • 2. 发明授权
    • Voltage controlled oscillator circuit and disc reproducing apparatus
    • 压控振荡器电路和盘再现装置
    • US6064271A
    • 2000-05-16
    • US104995
    • 1998-06-26
    • Mamiko OkuboHiroshi Shimada
    • Mamiko OkuboHiroshi Shimada
    • G11B20/14H03L7/081H03L7/099H03L7/00
    • H03L7/0805G11B20/1403H03L7/0812H03L7/0997
    • In a disc reproducing apparatus using a VCO (voltage controlled oscillator) circuit, the VCO circuit includes a first delay cell array having gates supplied with a first control voltage DCV, a ring oscillator including a second delay cell array having gates supplied with a second control voltage Vin, and a switch for selecting the number of delay cells from the second delay cell array. The oscillation frequency of the ring oscillator is determined by a time delay of the second delay cell array. When the second control voltage Vin having the same value as the first control voltage DCV is inputted to the gates of the delay cells of the second delay cell array, the ring oscillator oscillates with a frequency determined by the ratio of the number of the delay cells of the first delay cell array to number of the delay cells of the second delay cell array. By operating the selection switch to change the number of delay cells constituting the second delay cell array, the voltage controlled oscillator (VCO) circuit can generates a signal of an oscillation frequency of a frequency division ratio other than 1/2.sup.n, by using at least one reference clock.
    • 在使用VCO(压控振荡器)电路的盘再现装置中,VCO电路包括具有提供有第一控制电压DCV的栅极的第一延迟单元阵列,包括第二延迟单元阵列的环形振荡器,第二延迟单元阵列具有提供有第二控制 电压Vin和用​​于从第二延迟单元阵列中选择延迟单元的数量的开关。 环形振荡器的振荡频率由第二延迟单元阵列的时间延迟确定。 当具有与第一控制电压DCV相同值的第二控制电压Vin被输入到第二延迟单元阵列的延迟单元的栅极时,环形振荡器以由延迟单元的数量的比率确定的频率振荡 的第一延迟单元阵列到第二延迟单元阵列的延迟单元的数目。 通过操作选择开关来改变构成第二延迟单元阵列的延迟单元的数量,压控振荡器(VCO)电路可以产生除+ E之外的分频比的振荡频率的信号,f 1/2 + EE n,通过使用至少一个参考时钟。