TEMPERATURE COMPENSATION CIRCUIT FOR A CRYSTAL OSCILLATOR AND METHOD OF PROVIDING SAME
    1.
    发明申请
    TEMPERATURE COMPENSATION CIRCUIT FOR A CRYSTAL OSCILLATOR AND METHOD OF PROVIDING SAME 审中-公开
    晶体振荡器的温度补偿电路及其提供方法

    公开(公告)号:WO1998027652A1

    公开(公告)日:1998-06-25

    申请号:PCT/US1997021618

    申请日:1997-11-25

    Applicant: MOTOROLA INC.

    CPC classification number: H03L1/025 H03B5/368 H03J7/12 H03L1/028 H04B1/40

    Abstract: A temperature compensation (TC) circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide TC digital data (30) for a crystal oscillator (18). In this way, the crystal oscillator module (12) does not require an on-board memory which substantially cuts costs. TC digital data (30) is converted to a TC signal (22) in a digital-to-analog converter which controls the crystal oscillator frequency. To compensate for radio voltage regulator variations over temperature, the crystal oscillator module (12) includes an on-board voltage regulator (34) which supplies a characterized regulated voltage (36) to the digital-to-analog converter such that the TC signal (22) from the digital-to-analog converter is inherently corrected for voltage variations in the voltage regulator (34). This improves stability of output frequency (20) from 5 ppm to about 2 ppm.

    Abstract translation: 一种在通信设备(200)中使用的用于晶体振荡器模块(12)的温度补偿(TC)电路(10)。 通信设备(200)的现有微控制器(210)用于为晶体振荡器(18)提供TC数字数据(30)。 以这种方式,晶体振荡器模块(12)不需要基本上降低成本的板上存储器。 TC数字数据(30)被转换成控制晶体振荡器频率的数 - 模转换器中的TC信号(22)。 为了补偿无线电压调节器的温度变化,晶体振荡器模块(12)包括一个板上电压调节器(34),其向数模转换器提供表征的调节电压(36),使得TC信号 固定地校正了电压调节器(34)中的电压变化。 这可以将输出频率(20)的稳定性从5ppm提高到约2ppm。

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