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    • 8. 发明授权
    • Crystal oscillator circuit using CMOSFETs
    • 使用CMOSFET的晶体振荡器电路
    • US06727769B2
    • 2004-04-27
    • US10157999
    • 2002-05-31
    • Katsuyoshi AiharaRyoji IwakuraTakakazu YanoYukio OtakaShinichi Komine
    • Katsuyoshi AiharaRyoji IwakuraTakakazu YanoYukio OtakaShinichi Komine
    • H03B532
    • H03B5/364H03B5/06
    • A crystal oscillator circuit using CMOSFETs including an oscillator circuit that is constructed of a resonating section and an amplifying section having a CMOSFET, a reference current source circuit for generating a reference current which determines a bias current of the amplifying section, and a control signal generator circuit for controlling the reference current source circuit to make a bias current larger than that in the oscillation status when the oscillator circuit is in the non-oscillation status. As a result, the reference current source circuit constant-current biases the DC bias of the amplifying section without depending on the source voltage. Therefore, it can lower the driving source voltage of the oscillator circuit. Further, only the bias current of the amplifying section is increased during the oscillation starting period of the oscillator circuit, so that the oscillator circuit can provide a stable oscillation with low power, without variations in the source voltage.
    • 一种使用CMOSFET的晶体振荡器电路,包括由谐振部分和具有CMOSFET的放大部分构成的振荡器电路,用于产生确定放大部分的偏置电流的参考电流的参考电流源电路,以及控制信号发生器 用于控制参考电流源电路以在振荡器电路处于非振荡状态时使偏置电流大于振荡状态时的偏置电流。 因此,参考电流源电路恒流偏置放大部分的直流偏压而不依赖于源极电压。 因此,可以降低振荡电路的驱动源电压。 此外,在振荡电路的振荡开始期间,只有放大部分的偏置电流增加,使得振荡器电路能够以低功率提供稳定的振荡,而不会使源极电压发生变化。