Power amplifier module
A power amplifier module includes an amplifier that amplifies an input signal and outputs an amplified signal, a matching circuit disposed between an output terminal of the amplifier and a subsequent circuit, a choke inductor having a first end to which a power supply voltage is applied and a second end from which power supply is provided to the amplifier through the output terminal of the amplifier, and a first attenuation circuit disposed between the output terminal of the amplifier and the second end of the choke inductor and configured to attenuate a harmonic component of the amplified signal.
1. A power amplifier module comprising:
an amplifier that amplifies an input signal and outputs an amplified signal from an output terminal;
a matching circuit disposed between the output terminal of the amplifier and a subsequent circuit;
a choke inductor, wherein a power supply voltage is applied to a first end of the choke inductor; and
a first attenuation circuit disposed between the output terminal of the amplifier and a second end of the choke inductor, the first attenuation circuit attenuating a third harmonic of the amplified signal, wherein:
the first attenuation circuit includes:
a first inductor, wherein a first end of the first inductor is connected to the output terminal of the amplifier and a second end of the first inductor is connected to the second end of the choke inductor, and
a first capacitor, wherein a first end of the first capacitor is connected to the second end of the first inductor and a second end of the first capacitor is grounded,
the matching circuit includes:
a second attenuation circuit that attenuates a second harmonic of the amplified signal, and
a high-pass filter having a cutoff frequency lower than a fundamental frequency of the amplified signal,
the second attenuation circuit is a low pass filter including:
a second inductor, wherein a first end of the second inductor is connected to the output terminal of the amplifier and a second end of the second inductor is connected to the high-pass filter, and
a second capacitor, wherein a first end of the second capacitor is connected to a second end of the second inductor and a second end of the second capacitor is grounded, and
the high-pass filter includes:
a third capacitor, wherein a first end of the third capacitor is connected to the second end of the second inductor, and
a third inductor, wherein a first end of the third conductor is connected to a second end of the third capacitor and a second end of the third capacitor is grounded.
2. The power amplifier module according to claim 1 , wherein the amplifier is embodied on a first chip, and
wherein the matching circuit, the choke inductor, and the first attenuation circuit are not embodied on the first chip.
3. The power amplifier module according to claim 2 , further comprising:
a third attenuation circuit that attenuates a second harmonic of the amplified signal,
wherein the third attenuation circuit is embodied on the first chip.
4. The power amplifier module according to claim 1 , further comprising:
a third attenuation circuit that attenuates a second harmonic of the amplified signal.
5. The power amplifier module according to claim 4 , the third attenuation circuit comprising a capacitor and an inductor connected in series between the output terminal and ground.