中图分类号： TN433
文献标识码： A
DOI：10.16157/j.issn.0258-7998.200258
中文引用格式： 谭传武，刘红梅. 改进型恒温晶振三次方补偿电路的研究与设计[J].电子技术应用，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

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