Power amplifier module
A power amplifier module includes an amplifier transistor and a bias circuit. A first power supply voltage based on a first operation mode or a second power supply voltage based on a second operation mode is supplied to the amplifier transistor. The amplifier transistor receives a first signal and outputs a second signal obtained by amplifying the first signal. The bias circuit supplies a bias current to the amplifier transistor. The bias circuit includes first and second resistors and first and second transistors. The first transistor is connected in series with the first resistor and is turned ON by a first bias control voltage which is supplied when the first operation mode is used. The second transistor is connected in series with the second resistor and is turned ON by a second bias control voltage which is supplied when the second operation mode is used.
1. A power amplifier module comprising:
an amplifier transistor to which a power supply voltage is supplied based on a mode signal supplied to the power amplifier module, the amplifier transistor receiving a first signal and outputting a second signal obtained by amplifying the first signal; and
a bias circuit that supplies a bias current to the amplifier transistor, wherein:
the power supply voltage is based on an average output power function according to a first operation mode or a second operation mode, and
the bias circuit includes:
a first resistor,
a first transistor that is connected in series with the first resistor and that is turned ON by a first bias control voltage which is supplied when the mode signal indicates that the first operation mode is to be used to amplify the first signal,
a second resistor, and
a second transistor that is connected in series with the second resistor and that is turned ON by a second bias control voltage which is supplied when the mode signal indicates that the second operation mode is to be used to amplify the first signal.
2. The power amplifier module of claim 1 , wherein, the first operation mode is a high power mode and the second operation mode is a low power mode.
3. A power amplifier module comprising:
an amplifier transistor to which a power supply voltage is supplied based on a mode signal supplied to the power amplifier module, the amplifier transistor receiving a first signal and outputting a second signal obtained by amplifying the first signal; and
a bias circuit that supplies a bias current to the amplifier transistor, wherein:
the power supply voltage is based on an average output power or an envelope of output power, and
the bias circuit includes:
a first resistor,
a first transistor that is connected in series with the first resistor and that is turned ON by a first bias control voltage which is supplied when the mode signal indicates that a first operation mode is to be used to amplify the first signal,
a second resistor, and
a second transistor that is connected in series with the second resistor and that is turned ON by a second bias control voltage which is supplied when the mode signal indicates that a second operation mode is to be used to amplify the first signal.
4. The power amplifier module of claim 3 , wherein, the power supply voltage is based on the envelope of output power when the mode signal indicates the first operation mode is to be used, and the power supply voltage is based on the average output power when the mode signal indicates the second operation mode is to be used.