中圖分類(lèi)號(hào)： TN433 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.200258 中文引用格式： 譚傳武，劉紅梅. 改進(jìn)型恒溫晶振三次方補(bǔ)償電路的研究與設(shè)計(jì)[J].電子技術(shù)應(yīng)用，2020，46(9)：51-56. 英文引用格式： Tan Chuanwu，Liu Hongmei. Design of cubic compensation circuit for constant temperature crystal oscillator[J]. Application of Electronic Technique，2020，46(9)：51-56.
Design of cubic compensation circuit for constant temperature crystal oscillator
Tan Chuanwu，Liu Hongmei
Department of Communication and Signal，Hunan Railway Professional Technology College，Zhuzhou 412001，China
Abstract： In the communication system, the receiving and transmitting synchronization can not be separated from the accurate clock frequency source. The accuracy of the clock frequency source directly affects the reliability of the system. AT cut crystal is an important part of the frequency source. Its frequency and temperature show a cubic function relationship, which makes it not suitable for a wide range of temperature application scenarios. In order to overcome the direct influence of temperature on frequency, this paper designs a kind of cubic function generating circuit for temperature compensation, including reference source, primary voltage generating circuit, cubic generating circuit and adding circuit, which can cancel the negative temperature coefficient produced by AT cut crystal in operation. The simulation results show that the reference circuit has a constant output of 1.856 V, the third-order circuit has a peak of 1.65 V and a trough of 0.85 V, and the added compensation circuit has a peak of 2.04 V and a trough of 1.74 V. The frequency error caused by the temperature change is well suppressed, and the problem that the output frequency of the oscillator changes with the temperature is solved.
Key words : temperature compensation；VCO；cubic function；band gap reference；frequency source
