一种针对RTC应用的数字温度补偿晶体振荡器

发布时间：2018-06-29 04:57

  本文选题：数字温度补偿晶体振荡器 + 温度补偿电路　； 参考：《电子技术应用》2017年01期

【摘要】：对于典型的数字电路FPGA、微处理器和微控制器等,需要提供精确的时钟信号。振荡电路产生的时钟信号频率受到老化、噪声、温度等因素影响。在导航、雷达、无线电通信和卫星通信等领域,需要产生对温度不敏感的时钟信号。介绍了一种针对RTC应用的温度控制振荡器的补偿电路,通过测温电路和逐次逼近模数转换器SAR ADC检测实时温度,结合EEPROM中对音叉晶体特性的测试结果,调整振荡电路的负载电容大小,可以使振荡器在-40℃~+85℃温度范围内的频率变化仅为5×10~(-6)。
[Abstract]:For typical digital circuits, such as FPGA, microprocessors and microcontrollers, precise clock signals are required. The frequency of clock signal produced by oscillating circuit is affected by aging, noise, temperature and so on. In areas such as navigation, radar, radio and satellite communications, temperature-insensitive clock signals need to be generated. This paper introduces a compensation circuit of temperature controlled oscillator for RTC application. It detects the real time temperature by temperature measuring circuit and successive approximation A / D converter SAR ADC, and combines the test results of tuning fork crystal characteristics in EEPROM. By adjusting the load capacitance of the oscillating circuit, the frequency variation of the oscillator in the temperature range of -40 鈩，

本文编号：2080951