Temperature-compensated crystal oscillator
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United States of America Patent
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Aug 3, 2004
Grant Date -
Aug 21, 2003
app pub date -
Feb 19, 2003
filing date -
Feb 20, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A temperature-compensated crystal oscillator (TCXO) comprises a voltage-controlled crystal oscillator (VCXO) having a crystal unit, a compensating voltage generator for generating a compensating voltage applied to the voltage-controlled crystal oscillator, a low pass filter inserted between the compensating voltage generator and voltage-controlled crystal oscillator, and a switching element connected in parallel with the low pass filter for short-circuiting across the low pass filter. In a manufacturing process of the temperature-compensated crystal oscillator, switching element is brought into a conducting state when an excitation electrode of the crystal unit is irradiated with an ion beam for adjusting the oscillation frequency.
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