Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2005-11-15
2008-08-19
Vuong, Quochien B (Department: 2618)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C455S522000, C375S297000, C330S278000
Reexamination Certificate
active
07415254
ABSTRACT:
There is provided a power control circuit having a stable high-speed operation, and a semiconductor device and a transceiver circuit using it. The power control circuit controls the gain of an amplifier so that power outputted from the amplifier reaches a desired value according to a digital control signal. The power control circuit includes a digital feedback loop which converts a detected signal obtained by detecting a value of the output power of the amplifier to a digital signal, determines a differential between the digital signal and the digital control signal, converts the differential to an analog signal and outputs a first feedback signal, an analog feedback loop which outputs a high frequency element corresponding to a differential between an analog signal to which the digital control signal is converted and the detected signal, as a second feedback signal, and an adder which determines the sum of the first and the second feedback signal and outputs a gain control signal for controlling the gain of the amplifier.
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Kuriyama Akira
Tanaka Satoshi
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Reed Smith LLP
Renesas Technology Corp.
Vuong Quochien B
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