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PLL、HSI和HSE振荡器也被断电。
PLL, the HSI and the HSE RC oscillators are also switched off.晶体振荡器未使用或不稳定。
External Oscillator is unused or not yet stable.Arduino如何计算时间？答案是，使用晶体振荡器。
How does Arduino calculate time? by using a crystal oscillator.在中高频率时，TAD应来源于器件的振荡器。
At moderate to high frequencies, TAD should be derived from the device oscillator.有关外部晶体的重要事项：晶体振荡器电路对PCB布局非常敏感。
Important Note on External Crystals: Crystal oscillator circuits are quite sensitive to PCB layout.该电路使用两个由IC1a和IC1c门构成的Colpitts型LC振荡器。
The circuit uses two Colpitts-type LC oscillators formed by the IC1a and IC1c gates.在Panther2500系列信号发生器中，YIG振荡器的输出由参考环路监控。
In 有关外部晶体的重要注意事项：晶体振荡器电路对PCB布局布线非常敏感。
Important Note on External Crystals: Crystal oscillator circuits are quite sensitive to PCB layout.为了测试接收机的最大灵敏度（和最长的传输范围），温度补偿晶体振荡器（TCXO）是强制性的。
To test the maximum sensitivity of the receiver(and the longest transmission range) a Temperature Compensated Crystal Oscillator(TCXO) is mandatory.IDT'的大部分实时时钟使用外部晶体振荡器，但有些则采用集成式振荡器以简化电路和减少物料清单(BOM)。
Most of IDT's real-time clocks use an external crystal oscillator, but some contain an integrated 晶体振荡器是最常见的线性振荡器，用于稳定大多数无线电发射机的频率，并在计算机和石英钟中产生时钟信号。
Crystal oscillators are the most common type of linear 对于精确的音频/视频同步，F4使用了一个TemperatureCompensatedCrystalOscillator(TCXO/温度补偿晶体振荡器)来产生0.2ppm准确度的时间码，这在这种价位下是首创。
For precise audio/video syncing, the F4 utilises a Temperature Compensated Crystal Oscillator(TCXO) that generates time code at 0.2 ppm accuracy.
