Class-E Outphasing Power Amplifier with Efficiency and Output Power Enhancement Circuits and Method

摘要

An outphasing amplifier includes a first class-E power amplifier (16-1) having an output coupled to a first conductor (31-1) and an input receiving a first RF drive signal (S1(t)). A first reactive element (CA-1) is coupled between the first conductor and a second conductor (30-1). A second reactive element (LA-1) is coupled between the second conductor and a third conductor (32-1). A second class-E power amplifier (17-1) includes an output coupled to a fourth conductor (31-2) and an input coupled to a second RF drive signal (S2(t)), a third reactive element (CA-3) coupled between the second and fourth conductors. Outputs of the first and second power amplifiers are combined by the first, second and third reactive elements to produce an output current in a load (R). An efficiency enhancement circuit (LEEC-1) is coupled between the first and fourth conductors to improve power efficiency at back-off power levels. Power enhancement circuits (20-1,2) are coupled to the first and fourth conductors, respectively.

主权项

1. An outphasing amplifier comprising:
(a) a first class-E power amplifier having an output coupled to a first conductor and an input coupled to a first RF drive signal, a first reactive circuit element coupled between the first conductor and a second conductor and a second reactive circuit element coupled between the second conductor and a third conductor; and (b) a second class-E power amplifier having an output coupled to a fourth conductor and an input coupled to a second RF drive signal, a third reactive circuit element coupled between the fourth conductor and the second conductor, the third conductor being coupled to a first terminal of a load, outputs of the first and second class-E power amplifiers being combined by means of the first, second, and third reactive elements to produce an output current in a load.