Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2008-03-18
2008-03-18
Urban, Edward F. (Department: 2618)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C330S269000, C330S130000, C455S093000
Reexamination Certificate
active
10844423
ABSTRACT:
In radio communication system that is able to transmit in two or more modulation modes, e.g., one modulation mode when phase shifts are performed and another modulation mode when phase shifts and amplitude shifts are performed, the disclosed invention can avoid that receiving band noise becomes so great not to conform to the GSM standards' prescription for such noise in a high voltage region of the power supply voltage, even when the output power is controlled by changing the amplitude of the input signal to the power amplifier circuitry while fixing the bias voltages to be applied to the power amplifying transistors. When the output power is controlled as above, in the modulation mode (GSM mode) when phase shifts are performed, idle currents flowing across the power amplifying transistors are regulated, depending on the power supply voltage, i.e., the idle currents are decreased when the power supply voltage is high and increased when the power supply voltage is low.
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Matsushita Kouichi
Nagamori Hiroyuki
Tsutsui Takayuki
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hannon Christian A.
Hitachi Hybrid Network Co., Ltd.
Reed Smith LLP
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