Telecommunications – Transmitter – Measuring – testing – or monitoring of transmitter
Reexamination Certificate
2005-11-29
2005-11-29
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter
Measuring, testing, or monitoring of transmitter
C455S114200, C455S063100
Reexamination Certificate
active
06970684
ABSTRACT:
The invention relates to a method for reducing interference in radio transmitters with feedback from the antenna end to the baseband side and to a transmitter applying the said method. In a Cartesian loop formed for the linearization of a transmitter, the levels of baseband input signals (sI2, sQ2) to a modulator are measured and the attenuation of a level control unit (210) following the modulator (203) is adjusted until the modulator input signal levels are sufficiently above the noise level. The adjustment may be carried out as a one-time procedure during the manufacturing process or repeatedly during the operation of the device. By means of the invention, the noise level of the output signal of a linearized transmitter can be made lower than in known transmitters. Moreover, the transmitter may utilize a cheaper and, from the point of view of manufacturing, easier 4modulator than known transmitters.
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Nokia Corporation
Perman & Green, LLP.
Trinh Sonny
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