Power control for a transmitter

Details Power control for a transmitter Power control for a transmitter

2006-05-30

2006-05-30

Vuong, Quochien B. (Department: 2685)

Telecommunications

Transmitter

Angle modulation

C455S127300, C375S297000, C330S010000, C330S12400D

Reexamination Certificate

active

07054597

ABSTRACT:
The invention relates to a transmitter which comprises a modulator providing a phase-modulated constant-envelope radio-frequency signal, and to a method of controlling the power level of a signal output by such a transmitter. In order to enable a power control over a large power range, it is proposed that a provided phase-modulated constant-envelope radio-frequency signal is divided into two identical signals for the power control. A first control arrangement then controls the output power for higher power levels by controlling amplifications applied to the two signals. A second control arrangement controls the output power for lower power levels by controlling phase shifts applied to the two signals. The processed signals are then combined and provided as a power controlled output signal.

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