Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2006-07-11
2006-07-11
Urban, Edward F. (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S127200, C455S067110, C375S219000, C375S297000
Reexamination Certificate
active
07076266
ABSTRACT:
A technique for calibrating the open-loop transmit power of a wireless communication device overcomes the inherent nonlinearities in the gain control input of a variable gain amplifier (VGA). In one embodiment, a feedback circuit generates a signal indicative of the transmit power. This signal is compared with a desired transmit power level, which comprises an open-loop gain component and a closed-loop gain component. The desired transmit power level is compared with the actual transmit power level and an error signal is generated. The error signal is used to alter the gain of the VGA in the transmitter to thereby adjust the actual transmit power level to correspond with the desired transmit power level. In alternative embodiment, the receiver portion, which also contains a VGA, is pre-calibrated in a conventional manner. During a transmitter calibration process, the transmitter is coupled to the receiver input through a mixer and filter. The pre-calibrated receiver determines the actual transmit power level. The difference is used to generate error correction data to adjust for non linearities in the gain control input of the transmitter VGA.
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Brown Charles D.
Chow Charles
Jenckes Kenyon
Qualcomm Inc
Urban Edward F.
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