H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/20 (2006.01) H03G 1/00 (2006.01) H03G 3/00 (2006.01) H04Q 7/32 (2006.01)
Patent
CA 2189718
A power amplifier system which makes it possible to reduce the power consumption at a low power output and to stably change the output power within a wide range. This power amplifier system includes a first power amplifier unit having a fixed gain, and a second power amplifier unit having a fixed gain, both of which are connected in cascade. The first amplifier unit receives and amplifies an initial input signal and outputs a first output signal. The second amplifier unit receives and amplifies the first output signal and outputs a second output signal. A supply voltage controller serves to control the supply or stop of a power supply voltage to the first and second amplifier units in response to a control signal. The output selector serves to select one of the first and second output signals and to output the selected signal as an output signal of the power amplifier system in response to the control signal. For low power level, only the first amplifier unit is activated and the first output signal is outputted as the output signal of the system. For higher power level, the first and second amplifier units are activated and the second output signal is outputted as the output signal of the system.
Corporation Nec
G. Ronald Bell & Associates
LandOfFree
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