A Voltage Controlled Temperature Compensated Crystal Oscillator
A technology of voltage-controlled crystal oscillation and crystal oscillator, applied in power oscillators, electrical components and other directions, can solve problems such as temperature drop of crystal oscillators
Active Publication Date: 2017-11-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0019] The purpose of the present invention is to overcome the deficiencies of the two varactor diodes in the prior art, and provide a voltage-controlled temperature compensated crystal oscillator (Voltage Controlled Temperature Compensate X'tal Oscillator, VCTCXO), so as to avoid crystal oscillation caused by the center frequency change. temperature drop problem
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[0041] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.
[0042] In the present invention, the voltage-controlled crystal oscillator has only one load varactor diode, and the temperature compensation voltage and the voltage-controlled voltage for adjusting the center frequency are considered as a whole. The solution is to build a system that takes the ambient temperature T and the voltage control voltage V as input, and the output frequency is f s The binary function relationship, therefore, how to obtain the binary function relationship (4) is the key of the specific embodiment. The present invention adopts the method of directl...
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The invention discloses a voltage-controlled temperature-compensated crystal oscillator, which considers the temperature-compensated voltage and the voltage-controlled voltage for adjusting the central frequency as a whole. The scheme is to construct a binary function that takes the ambient temperature T and the voltage control voltage V as input and the output frequency as fs. When in use, according to the ambient temperature Ta at that time and the required output frequency fa, the required voltage control voltage Va is calculated through the binary function, and the load varactor diode of the voltage-controlled crystal oscillator is added, then the crystal oscillator output is the desired output frequency. In the present invention, only one varactor diode is needed in the entire crystal oscillator, which avoids the mutual interference problem of the load capacitance formed by two varactor diodes in the prior art; at the same time, the equivalent load capacitance of the varactor diode is the crystal oscillator The capacitance value required for temperature compensation under the condition of the output frequency fa required by the oscillator can avoid the problem of temperature drop of the crystal oscillator caused by the change of the center frequency.
Description
technical field [0001] The invention belongs to the technical field of crystal oscillators, and more specifically relates to a voltage-controlled temperature-compensated crystal oscillator (Voltage Controlled Temperature Compensate X'talOscillator, VCTCXO) with a variable central frequency. Background technique [0002] The crystal oscillator is made of a quartz crystal plate with piezoelectric effect, which will produce mechanical vibration when it is subjected to an external alternating electric field. Due to the advantages of small size, light weight, high reliability, and high frequency stability, quartz crystal oscillators are widely used in various communication devices. Among them, the most used AT-cut quartz crystal resonator has a cubic curve in the relationship between frequency and temperature. [0003] Voltage Controlled Crystal Oscillator (VCXO) is composed of a crystal resonator (quartz crystal), a varactor diode and an oscillation circuit. By controlling the ...
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IPC IPC(8): H03B5/04
Inventor 黄显核刘东付玮焦俊杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA