VPPM-based quartz crystal oscillator temperature frequency characteristic modeling method
A technology of quartz crystal oscillator and frequency characteristics, which is applied in the field of electronic science, can solve problems such as inability to achieve precise compensation, achieve accurate frequency offset, improve compensation accuracy, and improve stability
Active Publication Date: 2022-07-12
上海柯锐芯微电子有限公司
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[0003] The temperature-frequency characteristics of traditional quartz crystal oscillators are generally described by a polynomial model (Polynomial Model, PM). The advantages of this traditional polynomial model lie in its simple structure and clear physical meaning, but its disadvantage is that the model uses fixed parameters, potentially assuming the temperature of the quartz crystal oscillator. The frequency characteristics are unchanged in different temperature ranges and under different temperature conditions
However, in practical applications and test scenarios, due to the complexity of the internal thermal characteristics of the crystal oscillator, the temperature frequency characteristics during the heating or cooling process are quite different, and there are also certain differences in different temperature operating ranges. Therefore, the traditional fixed parameter model is difficult. Accurate estimation of frequency variation, unable to achieve precise compensation
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Embodiment 1
[0039] A method for modeling temperature-frequency characteristics of quartz crystal oscillator based on VPPM, comprising the following steps:
[0040] Step 1: Data acquisition: simulate static changes in the test environment, and continuously change the ambient temperature to obtain the test temperature {T(i), i=0,1,...,N} and the corresponding output frequency of the crystal {f(i) ,i=0,1,...,N};
[0041] Step 2: Calculate the temperature derivative using the difference method:
[0042] dT(i)=T(i)-T(i-1) (1)
[0043] Step 3: Calculate the frequency offset:
[0044]
[0045] In the formula, f 0 base frequency
[0046] Step 4: Build a random neural network model:
[0047]
[0048] In the formula, is the weight parameter between the hidden layer and the output layer in the random neural network, and m represents the number of hidden layer nodes; is a variable parameter, obtained by fitting the test temperature and frequency offset; h(i) is the output vector of the...
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The invention discloses a quartz crystal oscillator temperature frequency characteristic modeling method based on a variable parameter polynomial model. The method comprises the steps of data acquisition, calculation by using a difference method to obtain a temperature derivative, calculation of frequency deviation, construction of a random neural network model and obtaining of weight parameters between a hidden layer and an output layer in a random neural network. According to the method, the influence of complex temperature change is converted into the change of model parameters, the frequency variation can be accurately estimated in different temperature change intervals and different temperature change conditions, and the improvement of the frequency stability of an electronic product is facilitated; according to the method, adaptive adjustment of model parameters is realized by using changes of temperature and temperature derivatives, a more reasonable variable parameter temperature-frequency characteristic model is established, frequency deviation during temperature change is calculated more accurately, and frequency deviation compensation precision is improved.
Description
technical field [0001] The invention relates to a method for modeling the temperature and frequency characteristics of a quartz crystal oscillator, in particular to a method for modeling the temperature and frequency characteristics of a quartz crystal oscillator based on VPPM, and belongs to the technical field of electronic science. Background technique [0002] Quartz crystal oscillator is a crystal resonator made of quartz material. It is the frequency source of many electronic communication systems and is widely used in various electronic products in the modern industrial society. The frequency of the quartz crystal is affected by many factors such as noise, aging, temperature, etc. Among them, the temperature is the most important factor affecting the frequency stability of the quartz crystal. The frequency of the quartz crystal oscillator changes with temperature, and the relationship between temperature and frequency is called the temperature-frequency characteristic...
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IPC IPC(8): G06F30/367G06N3/04G06N3/08G06F119/08
CPCG06F30/367G06N3/08G06F2119/08G06N3/047G06N3/048
Inventor 邓晓刚黄先日荆胜洁孙瑞王树彬刘豪
Owner 上海柯锐芯微电子有限公司