Quartz crystal oscillator frequency modulation circuit
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United States of America Patent
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Jan 9, 2001
Grant Date -
N/A
app pub date -
Jan 21, 1998
filing date -
Jan 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a voltage-controlled quartz crystal oscillator, including an oscillation transistor, the base of which is connected to a first terminal of a quartz crystal and the emitter of which is connected, via a first capacitor, to a second terminal of the quartz crystal connected to a first supply terminal, and including an active circuit introducing a variable capacitance between the base and the emitter of the oscillation transistor, the active circuit being voltage-controlled.
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