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    Voltage controlled oscillation circuit
    2.
    发明公开
    Voltage controlled oscillation circuit 失效
    Spannungsgesteuerte Oszillatorschaltung

    公开(公告)号：EP0889589A2

    公开(公告)日：1999-01-07

    申请号：EP98301197.4

    申请日：1998-02-18

    申请人： FUJITSU LIMITED

    发明人： Ozawa, Naoki, c/o Fujitsu Limited ,  Tani, Hiroaki, c/o Fujitsu LSI Technology Limited ,  Nomura, Kenichi c/o Fujitsu LSI Technology Limited

    IPC分类号： H03K3/03

    CPC分类号： H03K3/0315 ,  H03K3/014

    摘要： A voltage controlled oscillation circuit with an oscillation frequency thereof controlled in accordance with an external voltage is disclosed. An odd number of inversion circuit elements (1-1 to 1-(2n+1)) such as inverters for inverting output signals thereof with respect to input signals thereto are connected in series with each other. An output side of the last-stage one of the odd number of the inversion circuit elements (1-1 to 1-(2n+1)) is connected to an input side of the first-stage one of the inversion circuit elements (1-1 to 1-(2n+1)) to thereby cause an oscillation. A plurality of oscillation frequency variable control units (2-1 to 2-(2n+1)) such as variable resistor circuit elements for changing an oscillation frequency in accordance with an external voltage are each inserted between each set of adjacent inversion circuit elements. A plurality of fixed resistor circuit elements (3-1 to 3-(2n+1)) each having a fixed resistance value are connected in parallel with a plurality of the oscillation frequency variable control units (2-1 to 2-(2n+1)), respectively. The functions of both the variable resistor circuit elements and the fixed resistor circuit elements can be carried out at the same time by the use of a depletion type transistor or a transistor of a short channel type.

    摘要翻译： 公开了根据外部电压来控制其振荡频率的压控振荡电路。 诸如用于使输出信号相对于其输入信号反相的反相器的反转电路元件（1-1至1-（2n + 1））的奇数串联连接。 奇数个反转电路元件（1-1至1-（2n + 1））中最后一级的输出侧连接到第一级反相电路元件（1 -1至1（2n + 1）），从而引起振荡。 多个振荡频率可变控制单元（2-1〜2-（2n + 1）），例如用于根据外部电压改变振荡频率的可变电阻器电路元件分别插入每组相邻的反转电路元件之间。 每个具有固定电阻值的多个固定电阻电路元件（3-1至3-（2n + 1））与多个振荡频率可变控制单元（2-1至2-（2n + 1））。 可变电阻电路元件和固定电阻电路元件的功能可以通过使用耗尽型晶体管或短沟道型晶体管同时进行。