Power amplification module
A power amplification module includes: an amplifier that amplifies an input signal and outputs an amplified signal; and a harmonic-termination circuit to which harmonics of the amplified signal are input and the impedance of which is controlled in accordance with the frequency of a harmonic. The power amplification module can operate in a first mode in which a power supply voltage changes in accordance with the average voltage value of the amplified signal over a prescribed time period or in a second mode in which the power supply voltage changes in accordance with the envelope of the input signal. The impedance of the harmonic-termination circuit is controlled such that at least one even-ordered harmonic is short-circuited when the power amplification module operates in the first mode and at least one odd-ordered harmonic of third order or higher is short-circuited when the power amplification module operates in the second mode.
1. A power amplification module comprising:
an amplifier that amplifies an input signal and outputs an amplified signal according to a first mode or a second mode; and
a harmonic-termination circuit that controls an impedance in accordance with a frequency of a harmonic of the amplified signal, the amplified signal being input to the harmonic-termination circuit,
wherein when the amplifier operates in the first mode, a power supply voltage of the amplifier changes in accordance with an average value of a voltage of the amplified signal over a prescribed time period,
wherein when the amplifier operates in the second mode, the power supply voltage of the power amplifier changes in accordance with a waveform of an envelope of the input signal, and
wherein the harmonic-termination circuit is configured to:
short circuit at least one even-ordered harmonic of the amplified signal when the amplifier operates in the first mode, and
short circuit at least one odd-ordered harmonic of a third order or higher of the amplified signal when the amplifier operates in the second mode.
2. The power amplification module according to claim 1 ,
wherein the harmonic-termination circuit is an LC series resonant circuit that includes a first capacitor and a first inductor connected in series with each other between an output terminal of the amplifier and a reference potential, and
wherein a resonant frequency of the LC series resonant circuit becomes substantially equal to a frequency of the even-ordered harmonic or the odd-ordered harmonic, in accordance with the operation of the amplifier in the first mode or the second mode, by adjusting a capacitance of the first capacitor or an inductance of the first inductor.
3. A power amplification module comprising:
an amplifier that amplifies an input signal and outputs an amplified signal according to a first mode or a second mode; and
a harmonic-termination circuit that controls an impedance in accordance with a frequency of a harmonic of the amplified signal, the amplified signal being input to the harmonic-termination circuit,
wherein when the amplifier operates in the first mode, a power supply voltage of the amplifier changes in accordance with an average value of a voltage of the amplified signal over a prescribed time period,
wherein when the amplifier operates in the second mode, the power supply voltage of the power amplifier changes in accordance with a waveform of an envelope of the input signal,
wherein the harmonic-termination circuit is configured to:
short circuit at least one even-ordered harmonic of the amplified signal when the amplifier operates in the first mode, and
short circuit at least one odd-ordered harmonic of a third order or higher of the amplified signal when the amplifier operates in the second mode,
wherein the harmonic-termination circuit is an LC series resonant circuit that includes a first capacitor and a first inductor connected in series with each other between an output terminal of the amplifier and a reference potential,
wherein a resonant frequency of the LC series resonant circuit becomes substantially equal to a frequency of the even-ordered harmonic or the odd-ordered harmonic, in accordance with the operation of the amplifier in the first mode or the second mode, by adjusting a capacitance of the first capacitor or an inductance of the first inductor,
wherein the LC series resonant circuit further includes:
a second capacitor connected in parallel with the first capacitor, and
a first switch circuit connected in series with the first or second capacitor,
wherein the first switch circuit is controlled by a first control signal supplied in accordance with the operation of the amplifier in the first mode or the second mode such that a capacitance of the LC series resonant circuit is controlled to be a first value when the amplifier operates in the first mode and the capacitance of the LC series resonant circuit is controlled to be a second value when the power amplification module operates in the second mode, and
wherein the second value is smaller than the first value.
4. The power amplification module according to claim 3 , wherein the power supply voltage is the first control signal when the amplifier operates in the first mode and the reference potential is the first control signal when the power amplification module operates in the second mode.
5. The power amplification module according to claim 1 , further comprising:
a matching network provided between the amplifier and an output terminal of the amplification module, the matching network comprising a second inductor and a third capacitor,
wherein the second inductor has the amplified signal supplied to a first end, and
wherein a first end of the third capacitor is connected to a second end of the second inductor, and a second end of the third capacitor is grounded.
6. The power amplification module according to claim 2 , further comprising:
a matching network provided between the amplifier and an output terminal of the amplification module, the matching network comprising a second inductor and a third capacitor,
wherein the second inductor has the amplified signal supplied to a first end, and
wherein a first end of the third capacitor is connected to a second end of the second inductor, and a second end of the third capacitor is grounded.
7. The power amplification module according to claim 3 , further comprising:
a matching network provided between the amplifier and an output terminal of the amplification module, the matching network comprising a second inductor and a third capacitor,
wherein the second inductor has the amplified signal supplied to a first end, and
wherein a first end of the third capacitor is connected to a second end of the second inductor, and a second end of the third capacitor is grounded.
8. The power amplification module according to claim 4 , further comprising:
a matching network provided between the amplifier and an output terminal of the amplification module, the matching network comprising a second inductor and a third capacitor,
wherein the second inductor has the amplified signal supplied to a first end, and
wherein a first end of the third capacitor is connected to a second end of the second inductor, and a second end of the third capacitor is grounded.
9. A power amplification module comprising:
an amplifier that amplifies an input signal and outputs an amplified signal according to a first mode or a second mode;
a harmonic-termination circuit that controls an impedance in accordance with a frequency of a harmonic of the amplified signal, the amplified signal being input to the harmonic-termination circuit; and
a matching network provided between the amplifier and an output terminal of the amplification module,
wherein when the amplifier operates in the first mode, a power supply voltage of the amplifier changes in accordance with an average value of a voltage of the amplified signal over a prescribed time period,
wherein when the amplifier operates in the second mode, the power supply voltage of the power amplifier changes in accordance with a waveform of an envelope of the input signal,
wherein the harmonic-termination circuit is configured to:
short circuit at least one even-ordered harmonic of the amplified signal when the amplifier operates in the first mode, and
short circuit at least one odd-ordered harmonic of a third order or higher of the amplified signal when the amplifier operates in the second mode,
wherein the second inductor has the amplified signal supplied to a first end,
wherein a first end of the third capacitor is connected to a second end of the second inductor, and a second end of the third capacitor is grounded,
wherein the matching network further comprises a fourth capacitor connected in parallel with the third capacitor, and a second switch circuit connected in series with the third or fourth capacitor, and
wherein the second switch circuit is controlled by a second control signal supplied in accordance with the operation of the amplifier in the first mode or the second mode.
10. The power amplification module according to claim 6 ,
wherein the matching network further comprises a fourth capacitor connected in parallel with the third capacitor, and a second switch circuit connected in series with the third or fourth capacitor, and
wherein the second switch circuit is controlled by a second control signal supplied in accordance with the operation of the amplifier in the first mode or the second mode.
11. The power amplification module according to claim 7 ,
wherein the matching network further comprises a fourth capacitor connected in parallel with the third capacitor, and a second switch circuit connected in series with the third or fourth capacitor, and
wherein the second switch circuit is controlled by a second control signal supplied in accordance with the operation of the amplifier in the first mode or the second mode.
12. The power amplification module according to claim 8 ,
wherein the matching network further comprises a fourth capacitor connected in parallel with the third capacitor, and a second switch circuit connected in series with the third or fourth capacitor, and
wherein the second switch circuit is controlled by a second control signal supplied in accordance with the operation of the amplifier in the first mode or the second mode.
13. The power amplification module according to claim 9 ,
wherein the harmonic-termination circuit is a resonant circuit connected between an output terminal of the amplifier and a reference potential,
wherein the power supply voltage serves as the second control signal when the power amplification module operates in the first mode, and
wherein the reference potential serves as the second control signal when the power amplification module operates in the second mode.
14. The power amplification module according to claim 10 ,
wherein the power supply voltage serves as the second control signal when the power amplification module operates in the first mode, and
wherein the reference potential serves as the second control signal when the power amplification module operates in the second mode.
15. The power amplification module according to claim 11 ,
wherein the power supply voltage serves as the second control signal when the power amplification module operates in the first mode, and
wherein the reference potential serves as the second control signal when the power amplification module operates in the second mode.
16. The power amplification module according to claim 12 ,
wherein the power supply voltage serves as the second control signal when the power amplification module operates in the first mode, and
wherein the reference potential serves as the second control signal when the power amplification module operates in the second mode.
17. The power amplification module according to claim 3 ,
wherein the power amplification module is formed as part of an integrated circuit, the integrated circuit having a first terminal to which the power supply voltage is supplied and a second terminal to which the first control signal is supplied, and
wherein the first terminal is adjacent to the second terminal.
18. The power amplification module according to claim 4 ,
wherein the power amplification module is formed as part of an integrated circuit, the integrated circuit having a first terminal to which the power supply voltage is supplied and a second terminal to which the first control signal is supplied, and
wherein the first terminal is adjacent to the second terminal.