Telecommunications – Transmitter – Amplitude modulation
Reexamination Certificate
2006-04-04
2006-04-04
Vo, Nguyen T. (Department: 2685)
Telecommunications
Transmitter
Amplitude modulation
C455S110000, C455S127200
Reexamination Certificate
active
07024167
ABSTRACT:
The invention provides a method and a device for amplitude modulation of a radio frequency signal using a variable-gain radio frequency power amplifier, for automatic control of the amplifier output signal by generating an error signal between an amplitude modulation signal and a signal representing the power of the amplifier output signal, from which a gain control signal of the amplifier is generated, to monitor potential saturation of the amplifier by comparing the relative phases of the error signal and of the amplitude modulation signal, and, in case of saturation of the amplifier, to generate a correction signal for lowering the operating point of the amplifier. The invention is applicable to a transmitter of a mobile station or a fixed station of a radio communication system.
REFERENCES:
patent: 3668533 (1972-06-01), Fish et al.
patent: 5276921 (1994-01-01), Kosugi
patent: 5430416 (1995-07-01), Black et al.
patent: 5589796 (1996-12-01), Alberth et al.
patent: 6043707 (2000-03-01), Budnik
patent: 6236267 (2001-05-01), Anzil
patent: WO 00/30245 (2000-05-01), None
patent: WO 00/35080 (2000-06-01), None
Nortel Networks France
Trop Pruner & Hu PC
Vo Nguyen T.
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