Switchable power amplifier

1. A circuit comprising:

a power amplification section having a first output stage power amplifier (PA) and a second output stage PA coupled, in parallel, with one another and configured to be complementarily controlled to alternatively place the power amplification section in a first amplification mode or a second amplification mode; and

a matching network having only one signal path coupled with the power amplification section, the signal path including a single line coupled with an output of the first output stage PA and an output of the second output stage PA,

wherein the matching network is configured to alternatively provide a first load impedance at the single line or a second load impedance at the single line based at least in part on whether the power amplification section is in the first amplification mode or the second amplification mode.

2. The circuit of claim 1 , wherein the first output stage PA and the second output stage PA are configured to be complementarily controlled such that the first output stage PA is activated and the second output stage PA is deactivated while the power amplification section is in the second amplification mode and both the first output stage PA and the second output stage PA are activated in the first amplification mode.

3. The circuit of claim 1 , wherein the first output stage PA includes a first transistor array and the second output stage PA includes a second transistor array that is interleaved with the first transistor array.

4. The circuit of claim 1 , wherein the matching network is configured to provide a first load impedance when the PA section is in a first amplification mode and a second load impedance when the PA section is in a second amplification mode.

5. The circuit of claim 1 , wherein the matching network further comprises:

a first spur coupled with the single line and having an inductor, a first capacitor, and a switch coupled, in series, with one another, the switch configured to open to provide the first load impedance and close to provide the second load impedance;

a second spur coupled with the single line and having a second capacitor; and

a third spur coupled with the single line and having a third capacitor.

6. The circuit of claim 5 , wherein the inductor is configured to tune out capacitance provided to the matching network by the second capacitor.

7. The circuit of claim 6 , wherein the inductor is further configured to tune out capacitance provided to the matching network by the third capacitor.

8. The circuit of claim 5 , wherein the matching network further comprises:

one or more additional spurs, each having a respective capacitor.

9. The circuit of claim 5 , wherein the inductor is a first inductor and the first spur is coupled in parallel with the second spur and both the first spur and the second spur are coupled, in series, with a second inductor.

10. The circuit of claim 9 , wherein the second inductor is between a ground and the first and second spurs.

11. The circuit of claim 9 , wherein the second inductor is between the single line and the first and second spurs.

12. The circuit of claim 5 , wherein the inductor is a first inductor and the second spur further includes a second inductor coupled, in series, with the second capacitor.

13. A method comprising:

controlling a first output stage power amplifier (PA) and a second output stage PA, which are coupled in a parallel with one another, in a manner to set an amplification circuitry in a first amplification mode or a second amplification mode; and

controlling a matching network, having only one signal path coupled with the power amplification section, the signal path including a single line coupled with the first output stage PA and the second output stage PA, the controlling of the matching network to provide a first load impedance on the single line or a second load impedance on the single line based at least in part on whether the amplification circuitry is set in the first amplification mode or the second amplification mode.

14. The method of claim 13 , wherein said controlling the first output stage PA and the second output stage PA comprises:

activating both the first output stage PA and the second output stage PA to set the amplification circuitry in the first amplification mode; and

activating the first output stage PA and deactivating the second output stage PA to set the amplification circuitry in the second amplification mode.

15. The method of claim 13 , wherein said controlling the matching network comprises:

providing a first load impedance when the amplification circuitry is in the first amplification mode; and

providing a second load impedance when the amplification circuitry is in the second amplification mode.

16. A system comprising:

a transceiver configured to provide a radio frequency signal and one or more control signals;

amplification circuitry coupled with the transceiver to receive the RF signal and the one or more control signals and configured to output an amplified RF signal, the amplification circuitry including

a power amplification section having a first output stage power amplifier (PA) and a second output stage (PA) coupled, in parallel, with one other and configured to be complementarily controlled by the one or more control signals to alternatively place the amplification circuitry in a first amplification mode or a second amplification mode; and

a matching network having only one signal path coupled with the power amplification section, the signal path including a single line coupled with an output of the first output stage PA and an output of the second output stage PA, the matching network being configured to provide a switchable impedance on the single line based at least in part on whether the PA section is in the first amplification mode or the second amplification mode; and

an antenna structure coupled with the amplification circuitry and configured to facilitate an over-the-air (OTA) transmission of the amplified RF signal.

17. The system of claim 16 , wherein the first output stage PA and the second output stage PA are configured to be complementarily controlled such that the first output stage PA is activated and the second output stage PA is deactivated while the power amplification section is in the second amplification mode and both the first output stage PA and the second output stage PA are activated in the first amplification mode.

18. A system comprising:

a transceiver configured to provide a radio frequency signal and one or more control signals;

amplification circuitry coupled with the transceiver to receive the RF signal and the one or more control signals and configured to output an amplified RF signal, the amplification circuitry including

a power amplification section having a first output stage power amplifier (PA) and a second output stage (PA) coupled, in parallel, with one other and configured to be complementarily controlled by the one or more control signals to alternatively place the amplification circuitry in a first amplification mode or a second amplification mode, wherein the first output stage PA includes a first transistor array and the second output stage PA includes a second transistor array that is interleaved with the first transistor array; and

a matching network having only one signal path coupled with the power amplification section, the signal path including a single line coupled with an output of the first output stage PA and an output of the second output stage PA, the matching network being configured to provide a switchable impedance on the single line based at least in part on whether the PA section is in the first amplification mode or the second amplification mode; and

an antenna structure coupled with the amplification circuitry and configured to facilitate an over-the-air (OTA) transmission of the amplified RF signal.

19. The system of claim 16 , wherein the matching network is configured to provide a first load impedance when the power amplification section is in a first amplification mode and a second load impedance when the PA section is in a second amplification mode.