Research Of Temperature Compensation Technique For The Quartz Crystal Oscillator

The rapid development of modern electronic technology makes quartz crystal oscillators widely applied in electronic equipments such as communication,navigation,radar,measure instruments etc.Many devices work in the environment which the temperature changes in a larger range, the change of temperature will cause the crystal oscillator’s frequency shift. In this case, the crystal oscillat or can not provide a stable clock frequency, which results in the abnormality of the device.The temperature compensated crystal oscillator imprive defect and is being applid more and more widely in various fields.According to the problem, this dissertation mainly carries out on the AT-cut crystal oscillator’s temperature compensation research.Based on the study the frequency temperature characteristics of AT-cut crystal oscillator and a variety compensation techniques, this dissertation finally adopts a microprocessor temperatu compensation method, which increases the temperature frequency stability of the10MHZ crystal oscillator.This dissertation studies the frequency-temperature characteristics as well as temperature compensation principle of the AT-cut crystal oscillator. Through the compensation of the traditional compensation methods, this dissertation brings forward the microprocessor temperature compensation method.The overall design is advanced,a novel kind of microcomputer compensated crystal oscillator is designed which use a10-bit D/A digital processor AD5310BRT and microcomputer STC89C52RC as its core. In the thesis, it is introduced in detail that the operating principle,the system structure,the hardware design and the operating program of the temperature compensation system;use the least square method to realize the function approximation and the ultimate experimental results prove feasibility of this design.At last we analyze the results and find out someshortages in the design and give some improved ways.The system makes full use of processor resources and give full play to the role of the software,through software and hardware complement each other,saving for a lot of bulky, high-power,expensive devices. At last, the debugging is carried out through experiments and procedures optimization, and ultimately the design reaches the desired target.