Ecliptek泛音石英晶体如何工作?，美国日蚀公司是一家集设计和销售为一体化的元器件制造商，主要向广泛应用市场提供极其具有价值的石英晶体产品为主，通过自身的努力与拼搏，研发大量高质量低成本石英晶振，同时也保证产品的品质，随着产品的快速推出市场，并得到广大用户的支持与信赖，使得日蚀公司发展日趋强大，而在激烈的市场斗争之中，日蚀公司不断调整自我的定位，对于小型化的石英晶体产品有了更多的见解，也十分乐意分享更多关于产品方面的知识，与用户保持着共同成长，也因此吸引了更多同频的合作伙伴加入日蚀公司。
在当今世界，快速流畅的数据传输至关重要。网络和服务器系统被设计成以闪电般的速度处理和转发信息。为了实现这一点，许多应用依赖于三位数兆赫兹(MHz)范围内的频率。
这样高的频率是不能用AT晶体的基音产生的。尽管石英盘具有40到50兆赫基频是可行的它们的生产涉及相当大的努力和相应的成本。因此，“泛音晶体”通常用于20兆赫以上的频率。
每个石英坯都有其基本频率。除了这个“基音”，每个石英盘还有几个泛音。当电压施加在石英上时，石英以其基本音调振荡。它的泛音也在这个过程中被触发，但它们的信号明显弱于基音。事实上，在大多数情况下，泛音信号只会产生正常的相位噪声。Ecliptek泛音石英晶体如何工作?
通过振荡器电路的巧妙构造，可以激励石英的泛音而不是基音。因此，为了放大石英的泛音信号，在振荡器电路中增加了一个附加的谐振电路。
这项技术允许工程师从压电石英晶体中“挤出”远高于其基频的频率。例如，如果石英以20MHz的基音振荡，第三泛音以60MHz振荡，第五泛音以100MHz振荡。由于振荡器电路的电子特性，泛音只能在奇数整数范围内被激发。
剩下的问题是关于泛音石英振荡的形状。你可以把泛音振荡想象成晶体基波振荡的倍数。
厚度剪切振子在其基音中的振荡
让我们拿着厚度剪切振荡器举个例子:在电压下，石英的顶部和底部在基音中向相反的方向移动。但是在泛音中，不仅是石英的上下两面在振荡，它内部的分子层也在振荡。这些层也向相反的方向移动，就像水晶在基础音调中的顶部和底部一样。石英贴片晶振不仅在它的外部振动，也可以说“在它自身”振动。
形象地说，人们可以把泛音石英想象成一个连接在长链上的钟摆。在基音中，只有钟摆会摆动，但在泛音中，每个链节也会摆动。
受泛音驱动的石英可以产生频率高达250MHz，从而为通信技术中的快速数据传输创造了完美的基础。
A fast and smooth data transmission is critical in today’s world. Network and server systems are designed to process and forward information at lightning fast speeds. To achieve this, many of these applications depend on frequencies in the three-digit megahertz (MHz) range.
制造商零件编号
供应商
描述
工作温度
EB3250AYA08-8.000M TR
Ecliptek晶振
CRYSTAL 8.0000MHZ 8PF SMD
-40°C ~ 125°C
E1SJA18-6.000M TR
Ecliptek晶振
CRYSTAL 6.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-18.432M TR
Ecliptek晶振
CRYSTAL 18.4320MHZ 18PF SMD
-40°C ~ 85°C
E1SFA18-4.000M TR
Ecliptek晶振
CRYSTAL 4.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-14.31818M TR
Ecliptek晶振
CRYSTAL 14.31818MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-6.144M TR
Ecliptek晶振
CRYSTAL 6.1440MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-28.63636M TR
Ecliptek晶振
CRYSTAL 28.63636MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-13.000M TR
Ecliptek晶振
CRYSTAL 13.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-19.6608M TR
Ecliptek晶振
CRYSTAL 19.6608MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-9.8304M TR
Ecliptek晶振
CRYSTAL 9.8304MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-32.000M TR
Ecliptek晶振
CRYSTAL 32MHZ 18PF SMD
-
EA2025MA10-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 10PF SMD
-40°C ~ 85°C
EA2025MA10-32.000M TR
Ecliptek晶振
CRYSTAL 32.0000MHZ 10PF SMD
-40°C ~ 85°C
E1WCDA12-32.768K
Ecliptek晶振
CRYSTAL 32.7680KHZ 12.5PF TH
-10°C ~ 60°C
E1SJA18-18.000M TR
Ecliptek晶振
CRYSTAL 18.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-20.000M TR
Ecliptek晶振
CRYSTAL 20.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-14.7456M TR
Ecliptek晶振
CRYSTAL 14.7456MHZ 18PF SMD晶振
-40°C ~ 85°C
E1SCA18-7.3728M TR
Ecliptek晶振
CRYSTAL 7.3728MHZ 18PF SMD
-40°C ~ 85°C
E1SEA18-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 18PF SMD
-20°C ~ 70°C
E1SEA18-12.000M TR
Ecliptek晶振
CRYSTAL 12.0000MHZ 18PF SMD
-20°C ~ 70°C
E1SJA18-10.000M TR
Ecliptek晶振
CRYSTAL 10.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-12.000M TR
Ecliptek晶振
CRYSTAL 12.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-11.0592M TR
Ecliptek晶振
CRYSTAL 11.0592MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-8.000M TR
Ecliptek晶振
CRYSTAL 8.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-3.579545M TR
Ecliptek晶振
CRYSTAL 3.579545MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-4.194304M TR
Ecliptek晶振
CRYSTAL 4.194304MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-16.9344M TR
Ecliptek晶振
CRYSTAL 16.9344MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-5.000M TR
Ecliptek晶振
CRYSTAL 5.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-13.500M TR
Ecliptek晶振
CRYSTAL 13.5000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-9.216M TR
Ecliptek晶振
CRYSTAL 9.2160MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-12.288M TR
Ecliptek晶振
CRYSTAL 12.2880MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-4.500M TR
Ecliptek晶振
CRYSTAL 4.5000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-15.000M TR
Ecliptek晶振
CRYSTAL 15.0000MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-4.433619M TR
Ecliptek晶振
CRYSTAL 4.433619MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-16.384M TR
Ecliptek晶振
CRYSTAL 16.3840MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-6.7458M TR
Ecliptek晶振
CRYSTAL 6.7458MHZ 18PF SMD
-40°C ~ 85°C
E1SJA18-15.360M TR
Ecliptek晶振
CRYSTAL 15.3600MHZ 18PF SMD
-40°C ~ 85°C
E1SDA18-25.000M TR
Ecliptek晶振
CRYSTAL 25.0000MHZ 18PF SMD
0°C ~ 70°C
E1SJA18-4.9152M TR
Ecliptek晶振
CRYSTAL 4.9152MHZ 18PF SMD
-40°C ~ 85°C
E1SGA18-25.000M TR
Ecliptek晶振
CRYSTAL 25.0000MHZ 18PF SMD
0°C ~ 70°C
EA2532QA18-26.000M TR
Ecliptek晶振
CRYSTAL 26.0000MHZ 18PF SMD
-40°C ~ 85°C
EA2532QA18-20.000M TR
Ecliptek晶振
CRYSTAL 20.0000MHZ 18PF SMD
-40°C ~ 85°C
EA2532LA18-30.000M TR
Ecliptek晶振
CRYSTAL 30.0000MHZ 18PF SMD
-40°C ~ 85°C
EA2532QA18-13.560M TR
Ecliptek晶振
CRYSTAL 13.5600MHZ 18PF SMD
-40°C ~ 85°C
EB2532YA12-24.000M TR
Ecliptek晶振
CRYSTAL 24.0000MHZ 12PF SMD
-40°C ~ 125°C
EB1216JA10-26.000M TR
Ecliptek晶振
CRYSTAL 26.0000MHZ 10PF SMD
-40°C ~ 85°C
EB1620JA10-24.000M TR
Ecliptek晶振
CRYSTAL 24.0000MHZ 10PF SMD
-40°C ~ 85°C
EA2025JA18-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 18PF SMD
-40°C ~ 85°C
E1WSDA12-32.768K TR
Ecliptek晶振
CRYSTAL 32.7680KHZ 12.5PF SMD
-10°C ~ 60°C
EA2025JA18-32.000M TR
Ecliptek晶振
CRYSTAL 32.0000MHZ 18PF SMD
-40°C ~ 85°C
EA2025JA10-24.000M TR
Ecliptek晶振
CRYSTAL 24.0000MHZ 10PF SMD
-40°C ~ 85°C
EB3250JA12-10.000M TR
Ecliptek晶振
CRYSTAL 10.0000MHZ 12PF SMD
-40°C ~ 85°C
EB3250AYA08-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 8PF SMD
-40°C ~ 125°C
EB3250YA12-12.000M TR
Ecliptek晶振
CRYSTAL 12.0000MHZ 12PF SMD
-40°C ~ 125°C
EB3250AYA08-10.000M TR
Ecliptek晶振
CRYSTAL 10.0000MHZ 8PF SMD
-40°C ~ 125°C
E1SJA18-24.000M TR
Ecliptek晶振
CRYSTAL 24.0000MHZ 18PF SMD
-40°C ~ 85°C
EA2532LA18-25.000M TR
Ecliptek晶振
CRYSTAL 25.0000MHZ 18PF SMD
-40°C ~ 85°C
EA2532UA12-24.000M TR
Ecliptek晶振
CRYSTAL 24.0000MHZ 12PF SMD
-40°C ~ 85°C
EB2532JA12-30.000M TR
Ecliptek晶振
CRYSTAL 30.0000MHZ 12PF SMD
-40°C ~ 85°C
EB2532JA12-18.432M TR
Ecliptek晶振
CRYSTAL 18.4320MHZ 12PF SMD
-40°C ~ 85°C
EB2532YA12-18.432M TR
Ecliptek晶振
CRYSTAL 18.4320MHZ 12PF SMD
-40°C ~ 125°C
EB1216JA10-25.000M TR
Ecliptek晶振
CRYSTAL 25.0000MHZ 10PF SMD
-40°C ~ 85°C
EB1216JA10-32.000M TR
Ecliptek晶振
CRYSTAL 32.0000MHZ 10PF SMD
-40°C ~ 85°C
EB3250JA12-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 12PF SMD
-40°C ~ 85°C
EB3250YA12-16.000M TR
Ecliptek晶振
CRYSTAL 16.0000MHZ 12PF SMD
-40°C ~ 125°C
EB3250YA12-10.000M TR
Ecliptek晶振
CRYSTAL 10.0000MHZ 12PF SMD
-40°C ~ 125°C
EB3250YA12-24.000M TR
Ecliptek晶振
CRYSTAL 24.0000MHZ 12PF SMD
-40°C ~ 125°C
E3WSDC12-32.768K TR
Ecliptek晶振
CRYSTAL 32.7680KHZ 12PF SMD
-40°C ~ 85°C
E1SBA18-3.6864M TR
Ecliptek晶振
CRYSTALS 3.6864MHZ 50PPM 18PF PA
-
E1SBA18-7.3728M TR
Ecliptek晶振
CRYSTALS 7.3728MHZ 50PPM 18PF PA
-
E1SBA18-8.000M TR
Ecliptek晶振
CRYSTALS 8.000MHZ 50PPM 18PF PAR
-
E1SHA18-11.0592M TR
Ecliptek晶振
CRYSTALS 11.0592MHZ 15PPM 18PF P
-
E1SCA18-3.6864M TR
Ecliptek晶振
CRYSTALS 3.6864MHZ 50PPM 18PF PA
-
E1SFA18-8.000M TR
Ecliptek晶振
CRYSTALS 8.000MHZ 30PPM 18PF PAR
-
E1SHA18-7.3728M TR
Ecliptek晶振
CRYSTALS 7.3728MHZ 15PPM 18PF PA
-
Such high frequencies cannot be generated with an AT-crystal in the fundamental tone. Although quartz discs with a fundamental frequency of 40 to 50MHz are feasible, their production involves considerable effort and corresponding costs. For this reason, “overtone crystals” are usually used for frequencies above 20 megahertz.
Every quartz blank has its basic frequency. Besides this “fundamental tone”, each quartz disc has several overtones. When electric voltage is applied to the quartz, it oscillates on its fundamental tone. Its overtones are also triggered in this process, but their signal is significantly weaker than that of the fundamental tone. In fact, most of the time the overtone signal results in nothing more than normal phase noise.
By clever construction of the oscillator circuit, it is possible to actuate the overtone of the quartz instead of the fundamental tone. Therefore, an additional resonant circuit is added to the oscillator circuit in order to amplify the overtone signal of the quartz.
This technique allows engineers to “squeeze” frequencies far above its fundamental tone out of a quartz crystal. For example, if a quartz oscillates in the fundamental tone at 20MHz, the third overtone oscillates at 60MHz and the fifth overtone oscillates at 100MHz. Due to the electronic properties of the oscillator circuit, the overtones can only be stimulated in the odd integer range.
The remaining question is about the shape of an overtone quartz’s oscillation. You can imagine the overtone oscillation as a multiple of the crystal’s fundamental oscillation.
Let’s take the thickness shear oscillator as an example: Put under voltage, top and bottom of the quartz move in opposite directions in the fundamental tone. However, in the overtone, not only the upper and lower sides of the quartz oscillate, but also the molecular layers inside it. These layers also move in opposite directions, just like the crystal’s top and bottom in the fundamental tone. The quartz does not only vibrate on its outside, but “in itself”, so to speak.
Figuratively speaking, one can visualize an overtone quartz like a pendulum attached to a long chain. In the fundamental tone, only the pendulum swings, but in the overtone each individual chain link swings as well.
A quartz driven by its overtone can generate a frequency of up to 250MHz, thus creating the perfect base for fast data transmission in communication technology.
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