公开(公告)号：US06420938B1

公开(公告)日：2002-07-16

申请号：US09651829

申请日：2000-08-30

申请人： Lawrence Hoff ,  David Buck

发明人： Lawrence Hoff ,  David Buck

IPC分类号： H03L102

CPC分类号： H03L1/022 ,  H03L1/028

摘要： A software controlled crystal oscillator employing a method for digitally controlling a reference frequency of an oscillator, the method includes the steps of: locking a first signal produced by a first tunable software oscillator on to a first resonant frequency of a temperature sensing resonator; locking a second signal produced by a second tunable software oscillator on to a second resonant frequency of the temperature sensing resonator; estimating a temperature of the temperature sensing resonator using the first signal and the second signal; estimating the first resonant frequency and the second resonant frequency based upon the temperature; and adjusting the first signal to approximate the estimated first resonant frequency. An additional step includes controlling the reference frequency of the oscillator based upon the first signal such that the reference frequency is compensated for temperature.

摘要翻译： 一种采用数字控制振荡器参考频率的方法的软件控制晶体振荡器，该方法包括以下步骤：将由第一可调谐软件振荡器产生的第一信号锁定到温度感测谐振器的第一谐振频率; 将由第二可调软件振荡器产生的第二信号锁定到温度感测谐振器的第二谐振频率上; 使用第一信号和第二信号估计温度感测谐振器的温度; 基于温度估计第一谐振频率和第二谐振频率; 以及调整所述第一信号以近似估计的第一谐振频率。 附加步骤包括基于第一信号来控制振荡器的参考频率，使得参考频率被补偿温度。