Compensation of transient frequency drift in oscillator circuits
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United States of America Patent
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May 23, 1995
Grant Date -
N/A
app pub date -
Mar 8, 1993
filing date -
Mar 8, 1993
priority date (Note) -
Expired
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Abstract
A compensation circuit including resistors, capacitors and a varactor diode powered simultaneously by the same voltage source applied to a voltage controlled oscillator for reducing deviation from a desired oscillator output frequency on power-up. When power is applied, an exponentially varying voltage is applied to the varactor diode changing its capacitance in such a manner as to change the oscillator frequency in the opposite direction to its natural drift tendency, thus producing a substantially constant output frequency over the period of interest.
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