Method and apparatus for measuring frequency pulling in oscillators
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United States of America Patent
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Jun 28, 2005
Grant Date -
Jan 1, 2004
app pub date -
Mar 25, 2003
filing date -
Jun 28, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A test apparatus and method of measuring pulling of the frequency of an oscillator. The apparatus includes a bias tee, a power supply, a spectrum analyzer, a second power supply, a symmetrical resistive power splitter, a power meter and a synthesized signal generator. The method includes sweeping the synthesized signal generator frequency from the nominal frequency down to a first frequency. The first frequency is recorded when the oscillator goes out of frequency lock as a first pulling frequency. The synthesized signal generator frequency is then sweet from the nominal frequency up to a second frequency and the second pulling frequency is recorded when the oscillator goes out of frequency lock. The difference between the first and second pulling frequencies is the peak to peak pulling value.
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