Temperature compensation circuit of a crystal oscillator
A technology of temperature compensation circuit and crystal oscillator, applied in the field of electronics, can solve the problem of inability to meet the compensation accuracy, and achieve the effect of improving the temperature compensation accuracy
Inactive Publication Date: 2019-06-21
ZHONGXIANGBOQIAN INFORMATION TECH CO LTD
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Problems solved by technology
AT-cut crystals are most commonly used in the field of life and military affairs. The traditional temperature-compensated crystal oscillator (TCXO) compensation network for AT-cut quartz crystals generally uses a cubic polynomial about temperature, ignoring the gain KV of the voltage-controlled crystal oscillator. Factors that change with temperature cannot meet the requirements of compensation accuracy
Method used
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Embodiment 2
[0046] figure 2 It is another temperature compensation circuit for a crystal oscillator provided in Embodiment 2 of the present invention. see figure 2 In this embodiment, a temperature compensation circuit for a crystal oscillator includes a temperature sensor 201, a function generator 202, an adder 203, and a voltage-controlled crystal oscillator 204. For the connection relationship, refer to Embodiment 1. This embodiment is based on Embodiment 1 In the solution, further, it also includes: a trimming circuit 205, which is connected to the function generator 202 and the adder 203 respectively, and is used to adjust the resistance value of the input adder 203, so as to adjust the quadratic voltage signal and the cubic voltage signal respectively. The input coefficient of the quadratic term, the input coefficient of the cubic term, and the input coefficient of the quadratic term of the voltage signal and the fourth power voltage signal.
[0047] Furthermore, the trimming ci...
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The invention relates to a temperature compensation circuit of a crystal oscillator, which is connected with a function generator through a temperature sensor, converts a temperature signal, detectedby the temperature sensor, of a voltage-controlled crystal oscillator into a primary voltage signal, and transmits the primary voltage signal to the function generator; The function generator is connected with the adder and is used for sequentially converting the primary voltage signal into a secondary voltage signal, a tertiary voltage signal and a quartic voltage signal and respectively inputting the secondary voltage signal, the tertiary voltage signal and the quartic voltage signal into the adder; The adder is respectively connected with the temperature sensor and the voltage-controlled crystal oscillator and is used for adding the first-order voltage signal, the second-order voltage signal, the third-order voltage signal and the fourth-order voltage signal to obtain temperature compensation voltage, and the voltage of the voltage-controlled crystal oscillator is adjusted through the temperature compensation voltage to compensate the temperature of the voltage-controlled crystal oscillator; By adopting the circuit, the temperature compensation precision of the voltage-controlled crystal oscillator is improved.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a temperature compensation circuit of a crystal oscillator. Background technique [0002] Crystal oscillators are widely used in wireless systems and various military and civilian fields. Voltage-controlled crystal oscillators are another type of crystal oscillators besides constant temperature crystal oscillators (OCXO). Preheating the crystal can start working and other outstanding features. Although its stability and temperature difference are 1 to 3 orders of magnitude lower than constant temperature crystal oscillators, they are 1 to 3 orders of magnitude higher than other crystal oscillators. It also has excellent characteristics such as small distortion and is widely used in satellite communication and digital transmission systems and other fields. After the voltage-controlled crystal oscillator is powered on, it will take a period of cooling before it can enter the n...
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Inventor 张跃进曾庆生李光辉梅艳黄德昌李波
Owner ZHONGXIANGBOQIAN INFORMATION TECH CO LTD