Method and apparatus for the efficient test of the center frequency of bandpass filters
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United States of America Patent
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Oct 3, 2000
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N/A
app pub date -
Dec 10, 1997
filing date -
Dec 10, 1997
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Abstract
A method and apparatus for determining the center frequency of a bandpass filter. The center frequency of a bandpass filter is determined by applying a bias voltage to a bandpass filter circuit receiving a pair of differential input voltages and producing a pair of differential output voltages. The differential output voltages are modified to exhibit a notchband magnitude characteristic. A minimum value of the differential output voltages exhibiting the notchband characteristic over a predetermined range of frequencies is determined and corresponds to the center frequency of the bandpass filter.
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