| 摘要 |
PURPOSE: A power amplifier for portable terminals is provided to extend a battery's life by precisely controlling a DC bias current that determines a PAE(Power Added Efficiency) of a power amplifier. CONSTITUTION: An HPA(High Power Amplifier) module(1), in which an HPA(11), a nonvolatile memory(12) and an output supervision circuit(13) are embedded, is configured as one chip. A GaAs-Fet is used for the HPA(11) as a power amplification element. An EEPROM(Electrically Erasable Programmable Read Only Memory) is used as the nonvolatile memory(12). In the nonvolatile memory(12), the static characteristic data of the GaAs-Fet are recorded in advance. Terminals 'Vd' and 'Vg' are to input drain voltage and gate voltage from a bias control circuit(2) to the HPA(11). A terminal 'P-monitor' is to output an output signal of the output supervision circuit(13) to the bias control circuit(2). A terminal 'CE' is to make the nonvolatile memory(12) chip-enabled so that the bias control circuit(2) can read data recorded in the nonvolatile memory(12). The bias control circuit(2) inputs the read data through a terminal 'Data'. A terminal 'clock' is to supply a clock signal from the bias control circuit(2) to the nonvolatile memory(12). The bias control circuit(2) confirms a transmitting power, the output of the HPA(11), by an output signal of the output supervision circuit(13) and controls a DC bias current of the GaAs-FET on the basis of the static characteristic data, read from the nonvolatile memory(12), according to the transmitting power.
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