Telecommunications – Transmitter and receiver at same station – With tuning
Reexamination Certificate
2011-05-17
2011-05-17
Nguyen, Lee (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With tuning
C455S120000
Reexamination Certificate
active
07945218
ABSTRACT:
A method for tuning quality factor (Q) in a high-Q, high-frequency filter is provided that includes filtering an input signal to generate a filtered signal. The input signal comprises a specified frequency. The filtered signal comprises an actual phase shift with respect to the input signal. The actual phase shift is compared to a desired phase shift for the filtered signal to determine a difference between the actual phase shift and the desired phase shift. The desired phase shift corresponds to the specified frequency. The filter is tuned based on the difference between the actual phase shift and the desired phase shift.
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National Semiconductor Corporation
Nguyen Lee
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