Oscillator frequency control loop based on long term average of
frequency difference
    1.
    发明授权
    Oscillator frequency control loop based on long term average of frequency difference 失效
    基于频率差的长期平均振荡器频率控制回路

    公开(公告)号:US5473284A

    公开(公告)日:1995-12-05

    申请号:US313149

    申请日:1994-11-30

    CPC分类号: H03L7/10 H03L3/00

    摘要: An oscillator unit for a base station or the like in a digital cellular radio network. The oscillator unit includes an adjustable oven stabilized crystal oscillator (21). The oscillator unit additionally includes a non-volatile memory (27), in which is stored a control information defining the frequency of the oven stabilized crystal oscillator (21) at the start of the oscillator unit, apparatus (30, 31, 32) for deriving a reference frequency from a fixed digital transmission connection, such as a PCM connection, between the base station and the remaining cellular radio network, a frequency control loop (21, 22, 23, 24) for maintaining a long-term stability for the oven stabilized crystal oscillator (21) on the basis of a long-term average of the difference between the frequency of the oven stabilized crystal oscillator and the reference frequency.

    摘要翻译: PCT No.PCT / FI93 / 00129 Sec。 371日期1994年11月30日 102(e)1994年11月30日日期PCT 1993年3月30日PCT公布。 出版物WO93 / 20619 日期:1993年10月14日。在数字蜂窝无线电网络中用于基站等的振荡器单元。 振荡器单元包括可调节的炉子稳定的晶体振荡器(21)。 所述振荡器单元还包括非易失性存储器(27),其中存储了在所述振荡器单元的起始处定义所述恒温晶体振荡器(21)的频率的控制信息,所述装置(30,31,32)用于 从基站和剩余的蜂窝无线电网络之间的固定数字传输连接(例如PCM连接)导出参考频率,频率控制回路(21,22,23,24),用于维持对于所述基站的长期稳定性 基于炉稳定晶体振荡器的频率与参考频率之间的差的长期平均值来确定炉稳定晶体振荡器(21)。