Methods and apparatus for calibrating and controlling output...

Details Methods and apparatus for calibrating and controlling output... Methods and apparatus for calibrating and controlling output...

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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patent: 2004/0242170 (2004-12-01), Gilbert

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