发明名称 |
CRYSTAL OSCILLATOR |
摘要 |
A crystal oscillator has characteristics in that reduction in oscillation margin makes the crystal oscillator less likely to oscillate, with the result that an amplitude of a voltage waveform at an input terminal of a CMOS inverter is reduced. A crystal oscillator of the invention has a detection circuit that outputs an alarm signal when the amplitude of the voltage waveform at the input terminal of the CMOS inverter becomes equal to or less than a predetermined specified value. As a result, it is possible to detect a change in the oscillation margin of the crystal oscillator without switching between circuits even after the crystal oscillator is incorporated in a device. |
申请公布号 |
US2016181976(A1) |
申请公布日期 |
2016.06.23 |
申请号 |
US201514973819 |
申请日期 |
2015.12.18 |
申请人 |
FANUC Corporation |
发明人 |
SATO Junichi;WATANABE Katsuhiko |
分类号 |
H03B5/30 |
主分类号 |
H03B5/30 |
代理机构 |
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代理人 |
|
主权项 |
1. A crystal oscillator comprising:
a quartz resonator; an oscillation circuit part including a CMOS inverter, a capacitor, and a resistor and configured to oscillate the quartz resonator; a CMOS buffer serving as an output circuit part; and a detection circuit outputting an alarm signal when an amplitude of a voltage waveform at an input terminal of the CMOS inverter becomes equal to or less than at least one predetermined specified value. |
地址 |
Yamanashi JP |