【作者】 刘海霞；

【导师】 周渭；

【作者基本信息】 西安电子科技大学 ， 测试计量技术及仪器， 2000， 硕士

【摘要】 本文主要提出了一种以微处理器为核心的基于AT切晶体谐振器的新型微机补偿晶体振荡器（MCXO）。介绍了微机补偿晶体振荡器的构成，其各部分硬件电路的设计和工作原理及单片机部分软件和计算机部分曲线拟合软件的设计。并以实验结果证明了本文所述的温度补偿原理的可行性。系统中采用了微处理器这个关键器件，充分利用其具有的资源并充分发挥软件的作用，通过软件与简单硬件电路相配合的方法，节约了系统所需的大量硬件电路。与数字温度补偿晶体振荡器（DTCXO）相比，本文所叙述的微机补偿晶体振荡器具有结构简单，体积小，功耗低，造价低，开机预热时间短等优势，使其更具有竞争力。该振荡器可在-40℃～+70℃范围内稳定工作。补偿后频率温度稳定度可达±1.5×10^-7。一直以来，DTCXO由于体积大、功耗大、成本高而使其应用范围受到了很大的限制。本文所述的微机补偿晶体振荡器，最大限度的弥补了DTCXO的不足之处，也填补了国内微机补偿晶体振荡器这一空白。更多还原

【Abstract】 This paper presents a new type of microcomputer compensated crystal oscillator (MCXO) which bases on Al-cut crystal and uses microcomputer as its core. System structure, the design of every part of hardware and software are given. The experimental result proves the temperature compensated method is viable. Because microcomputer is used in system, function of its software can be utilized sufficiently. Software working with simple hardware makes a lot of hardware are saved. Comparing with digital temperature compensated crystal oscillator (DTCXO), the MCXO introduced in this paper has many advantages as follows, simple in structure, small in size, low in power, low in price and short in startup time. The MCXO can output an stable frequency of 1 OMI-Iz, and after compensated it stability can arrive at ?1.5 X 1 o. Because of DTCXO large in size, high in power and high in price, it utilization is limited. The MCXO in this paper compensates the disadvantages of DTCXO and fills the internal blank of MCXO.更多还原