温补晶振的一种实现方法

A Method for Realizing the Temperature-Compensated Crystal Oscillator

提出一种数字控制实现晶振温度补偿的方法．利用Matlab7.0对采集的数据进行分析处理，采用多项式拟合和多项式插值建立数学模型，并使用中值滤波法和程序判断滤波法对数据采集进行滤波，消除随机噪声对数据的干扰，以保证数据样本的稳定性．通过样品实例分析可以看出，在靠近非线性工作区的测试数据误差较大，工作电流也较大；在温度传感器的线性区-45～85℃的范围内可以对晶振进行有效补偿，频率的偏差在温度传感器的线性范围内可以控制在晶振频率的10^-7以内。

A method to realize the temperature-compensated crystal oscillator is proposed. Dealing sample data by Matlab 7.0 and using polynomial fitting and interpolation to establish the mathematical model, filtering by median filtering and programmer judge filtering to eliminate the disturb of the random noise, and make the sample data steady. Samples analysis show that the way we introduce can make a effective compensation to the crystal oscillator and the frequency warp can be control within 10^-1 of the crystal oscillator frequency under the linear area of the temperature sensor with-45～85℃ while the error of sample data and the working current is bigger at the nonlinear area.