Description: 围绕着如何提高石英晶体振荡器的频率稳定度，本文集中探讨了以下几个方面的工作：分析了石英谐振器的特性及其对晶体振荡器性能的影响，从而为高稳定度石英晶体振荡器中对石英晶体的选择提供了依据。分析了振荡电路基本原理，从而设计出由2N3904构成的石英晶体振荡电路，并对电路中输出电路部分及稳压部分设计中的问题进行讨论。最后，论述了恒温晶体振荡器的主要制作过程和技术指标，并对试制石英晶体振荡器样品技术性能进行了测试和分析。- Centered on how to improve the quartz crystal oscillator frequency stability, the paper focused on the following aspects of work: analysis of the quartz resonator and the characteristics of the performance of crystal oscillator, so as to the high degree of stability in the quartz crystal oscillator The crystal to provide the basis for the choice. Analysis of the basic tenets of oscillation circuit, designed by 2 N3904 posed by quartz crystal oscillator circuit, and circuits in output regulators and circuit design of some of the issues discussed. Finally, on a constant temperature crystal oscillator the main production process and technical indicators, and trial production of quartz crystal oscillator technical performance of samples were tested and analyzed. Platform: |
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Author:刘震洋 |
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Description: STM32时钟学习笔记(2010-01-27 09:23:15)转载标签：杂谈 分类：嵌入式
在STM32中，有五个时钟源，为HSI、HSE、LSI、LSE、PLL。
①、HSI是高速内部时钟 8M，RC振荡器，频率为8MHz。
②、HSE是高速外部时钟，可接石英/陶瓷谐振器，或者接
外部时钟源，频率范围为4MHz~16MHz。
③、LSI是低速内部时钟，RC振荡器，频率为40kHz。
④、LSE是低速外部时钟，接频率为32.768kHz的石英晶体。
⑤、PLL为锁相环倍频输出，其时钟输入源可选择为HSI/2、
HSE或者HSE/2。倍频可选择为2~16倍，但是其输出频率最
大不得超过72MHz。
-STM32 Clock study notes (2010-01-27 09:23:15) reproduced Tags: Zatan Category: Embedded in the STM32, five of the clock source for the HSI, HSE, LSI, LSE, PLL. ①, HSI is a high-speed internal clock 8M, RC oscillator frequency is 8MHz. ②, HSE is a high-speed external clock, which can be accessed quartz/ceramic resonator or external clock source connected, the frequency range of 4MHz ~ 16MHz. ③, LSI is the low-speed internal clock, RC oscillator, a frequency of 40kHz. ④, LSE is a low-speed external clock, then a frequency of 32.768kHz quartz crystal. ⑤, PLL output frequency for the PLL, the clock input source option for the HSI/2, HSE or HSE/2. Selectable frequency of 2 to 16 times, but its maximum output frequency must not exceed 72MHz. Platform: |
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Author:jie zhu |
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Description: 高精度的石英晶体测温:
通常,我们都在使用如热电偶,热电阻,热敏电阻,半导体或集成电路传感器....来测量温度,实际上,如果利用晶体来做温度传感器,其精度就会大幅度提高!
石英晶体的振荡频率会随温度的变化而发生微小的变化，利用这一特性，通过测量石英晶体振荡器的频率，就可司接测得相应的温度值，所以石英晶体谐振器还可用来进行温度的测量。测温石英晶体谐振器就属于这一类产品，它采用玻璃外壳封装软弓线电极，分辨率可达0.01℃-0·0001℃，适合作测温敏感元件。
这里给出的一份文件,摘录有从网络或书籍的有关晶体测温的基本介绍,供朋友们参考!同时,感谢有关网站与原书籍作者的宝贵资料! ------ 期望这种方法可以普及和更广泛的获得实际应用!
-High-precision quartz crystal thermometry:
Usually, we use such as Thermocouple, RTD, thermistor, semiconductor or integrated circuit sensor .... to measure the temperature, in fact, if you use the crystal to do the temperature sensor, its accuracy will be greatly improved!
Quartz crystal oscillator frequency variation with temperature and small changes, the use of this feature, by measuring the frequency of the quartz crystal oscillator, can the Secretary then measured the corresponding temperature value, so the quartz crystal resonator can also be used to the measurement of the temperature. The measured temperature quartz crystal resonator belongs to this type of product, which uses glass shell package soft arch wire electrode with a resolution of up to 0.01 ℃-0 · 0001 ° C, suitable for temperature sensitive components.
Given here a document, extract a basic introduction to the crystal temperature from the network or books for friends as a reference! The same time, Platform: |
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Author:蓝天 |
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Search - quartz crystal resonator