Reconfigurable radio frequency (RF) power amplifier circuit

1. An amplifier circuit, comprising:

a first adjustable amplification path and a second adjustable amplification path;

wherein the first adjustable amplification path and the second adjustable amplification path are configurable in different operating modes selected from a linear operating mode, an efficient operating mode, and an intermediate operating mode to amplify a transmission signal based at least in part on a characteristic of the transmission signal.

2. The amplifier circuit of claim 1 , further comprising a reconfigurable isolation circuit configured to selectively resistively couple an output of the first adjustable amplification path to an output of the second adjustable amplification path in the linear operating mode.

3. The amplifier circuit of claim 1 , further comprising a reconfigurable isolation circuit configured to selectively isolate an output of the first adjustable amplification path from an output of the second adjustable amplification path in the efficient operating mode.

4. The amplifier circuit of claim 1 , further comprising a peak to average power ratio (PAPR) detector configured to determine the characteristic of the transmission signal and develop a control signal to configure the amplifier circuit in one of the linear operating mode, the efficient operating mode, and the intermediate operating mode.

5. The amplifier circuit of claim 1 , further comprising:

an adjustable driver amplifier bias circuit for a driver amplifier and an adjustable power amplifier bias circuit for a power amplifier in each of the first adjustable amplification path and second adjustable amplification path, the adjustable driver amplifier bias circuit and the adjustable power amplifier bias circuit responsive to the characteristic of the transmission signal.

6. The amplifier circuit of claim 1 , wherein the characteristic of the transmission signal comprises a communication signal error vector magnitude value.

7. The amplifier circuit of claim 6 , wherein the characteristic of the transmission signal comprising the communication signal error vector magnitude value is influenced by antenna mismatch at an output of the amplifier circuit.

8. A method for communication, comprising:

determining at least one characteristic of a transmission signal; and

configuring an amplifier comprising a first adjustable amplification path and a second adjustable amplification path in different operating modes selected from a linear operating mode, an efficient operating mode, and an intermediate operating mode to amplify the transmission signal based at least in part on the characteristic of the transmission signal.

9. The method of claim 8 , further comprising resistively coupling an output of the first adjustable amplification path to an output of the second adjustable amplification path in the linear operating mode.

10. The method of claim 8 , further comprising isolating an output of the first adjustable amplification path from an output of the second adjustable amplification path in the efficient operating mode.

11. The method of claim 8 , further comprising:

determining a peak to average power ratio (PAPR) of the transmission signal to determine the characteristic of the transmission signal; and

generating a control signal to configure the amplifier in one of the linear operating mode, the efficient operating mode, and the intermediate operating mode.

12. The method of claim 8 , further comprising adjusting a bias of a driver amplifier and adjusting a bias of a power amplifier responsive to the characteristic of the transmission signal.

13. The method of claim 8 , wherein the characteristic of the transmission signal comprises a communication signal error vector magnitude value.

14. The method of claim 13 , wherein the characteristic of the transmission signal comprising the communication signal error vector magnitude value is influenced by antenna mismatch at an output of the amplifier.

15. A device, comprising:

means for determining at least one characteristic of a transmission signal;

first means for amplifying the transmission signal;

second means for amplifying the transmission signal, an output of the first means for amplifying being coupled to an output of the second means for amplifying; and

means for configuring the first means for amplifying and the second means for amplifying in different operating modes selected from a linear operating mode, an efficient operating mode, and an intermediate operating mode based at least in part on the characteristic of the transmission signal.

16. The device of claim 15 , further comprising:

means for selectively resistively coupling the output of the first means for amplifying to the output of the second means for amplifying in the linear operating mode.

17. The device of claim 15 , further comprising:

means for selectively isolating the output of the first means for amplifying from the output of the second means for amplifying in the efficient operating mode.

18. The device of claim 15 , further comprising:

means for determining a peak to average power ratio (PAPR) of the transmission signal to determine the characteristic of the transmission signal; and

means for developing a control signal to configure the device in one of the linear operating mode, the efficient operating mode, and the intermediate operating mode.

19. The device of claim 15 , further comprising:

means for adjusting a bias of a driver amplifier and means for adjusting a bias of a power amplifier responsive to the characteristic of the transmission signal.

20. The device of claim 15 , wherein the characteristic of the transmission signal comprises a communication signal error vector magnitude value.

21. The device of claim 20 , wherein the characteristic of the transmission signal comprising the communication signal error vector magnitude value is influenced by antenna mismatch at an output of the device.

22. An amplifier, comprising:

a first adjustable amplification path and a second adjustable amplification path; and

a reconfigurable isolator configured to selectively couple an adjustable resistance between an output of the first adjustable amplification path and an output of the second adjustable amplification path based at least in part on a characteristic of the transmission signal.

23. The amplifier of claim 22 , wherein the reconfigurable isolator is configured to selectively resistively couple the output of the first adjustable amplification path to the output of the second adjustable amplification path in a linear operating mode.

24. The amplifier of claim 22 , wherein the reconfigurable isolator is configured to selectively isolate the output of the first adjustable amplification path from the output of the second adjustable amplification path in an efficient operating mode.

25. The amplifier of claim 22 , further comprising a peak to average power ratio (PAPR) detector configured to determine the characteristic of the transmission signal and develop a control signal to configure the amplifier in one of a linear operating mode, an efficient operating mode, and an intermediate operating mode.

26. The amplifier of claim 22 , further comprising:

an adjustable driver amplifier bias circuit for a driver amplifier and an adjustable power amplifier bias circuit for a power amplifier in each of the first adjustable amplification path and second adjustable amplification path, the adjustable driver amplifier bias circuit and the adjustable power amplifier bias circuit responsive to the characteristic of the transmission signal.

27. The amplifier of claim 22 , wherein the characteristic of the transmission signal comprises a communication signal error vector magnitude value.

28. The amplifier of claim 27 , wherein the characteristic of the transmission signal comprising the communication signal error vector magnitude value is influenced by antenna mismatch at an output of the amplifier.