| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystal oscillation circuit capable of maintaining excellent oscillation even in an environment wherein a crystal vibrator receives a great amount of damping from an external medium. SOLUTION: A crystal oscillation circuit employing a transistor between a collector and an emitter to which a first crystal vibrator is connected is characterized in that a second crystal vibrator with a resonance frequency equal to an oscillating frequency is interposed in series between a base and a ground level. The crystal oscillation circuit is characterized in that an oscillation output is extracted from a connecting point between the base and a second crystal vibrator. The crystal oscillation circuit is characterized in that the oscillation output is extracted from a connecting point between the emitter and the first crystal vibrator. COPYRIGHT: (C)2006,JPO&NCIPI
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