Telecommunications – Transmitter – Measuring – testing – or monitoring of transmitter
Reexamination Certificate
2008-07-15
2008-07-15
Nguyen, Duc M. (Department: 2618)
Telecommunications
Transmitter
Measuring, testing, or monitoring of transmitter
C455S127100, C455S127200, C455S126000
Reexamination Certificate
active
07400866
ABSTRACT:
The present invention provides methods and apparatus for calibrating and controlling output power levels in a broadband communication system. The power level of an intermediate frequency (IF) signal may be varied at a first attenuator. The IF signal from the first attenuator may be frequency converted at a mixer to provide a desired transmit frequency converted signal. The power level of the frequency converted signal may be adjusted at a second attenuator. The signal may be sampled after the second attenuator in order to detect its output power level. The detected output power level may be compared with a reference level to obtain a difference signal. The difference signal may be used in a feedback loop to adjust the power level of the signal output from the first attenuator so that a constant output power level is maintained. Methods and apparatus for calibrating output power levels are also provided.
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Smentek David J.
Wilson Ronald E.
Cullen Larry T.
General Instrument Corporation
Nguyen Duc M.
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