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1. EP3145078 - DOHERTY POWER AMPLIFIER AND TRANSMITTER

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. A Doherty power amplifier (400), comprising:

a first amplification circuit (210), comprising a main power amplification branch and at least one auxiliary power amplification branch, wherein the main power amplification branch comprises a first main power amplifier (211), each auxiliary power amplification branch of the at least one auxiliary power amplification branch comprises multiple stages of auxiliary power amplifiers (212)(213), the main power amplification branch is configured to output an amplification signal to an output end of the main power amplification branch, and the at least one auxiliary power amplification branch is set to output an amplification signal to an output end of the at least one auxiliary power amplification branch when an output power of the first main power amplifier (211) reaches a first threshold;

a delay device (384), connected in the main power amplification branch, and configured to compensate for a delay difference between the main power amplification branch and the at least one auxiliary power amplification branch;

a combiner network (240), configured to: perform impedance inversion on the first amplification circuit (110), and couple the output end of the main power amplification branch and the output end of the at least one auxiliary power amplification branch to a load;

a first power divider (430), connected to an input end of the main power amplification branch and an input end of the at least one auxiliary power amplification branch, and configured to allocate an input signal of the first power divider (430) to the main power amplification branch and the at least one auxiliary power amplification branch;

a second amplification circuit (120), comprising a second main power amplification branch and a second auxiliary power amplification branch that are connected in parallel, wherein the second main power amplification branch comprises a second main power amplifier (121), the second auxiliary power amplification branch comprises at least one stage of second auxiliary power amplifier, the main power amplification branch is configured to output an amplification signal to an output end of the second amplification circuit (120), to drive the first main power amplifier (211), and the second auxiliary power amplification branch is set to output an amplification signal to the output end of the second amplification circuit (120) when an output power of the second main power amplifier (121) reaches a second threshold;

a second power divider (150), connected to an input end of the second main power amplification branch and an input end of the second auxiliary power amplification branch, and configured to allocate an input signal of the Doherty power amplifier to the second main power amplification branch and the second auxiliary power amplification branch, wherein the first power divider (130) is coupled between the first amplification circuit (110) and the second amplification circuit (120), and is configured to allocate, to the main power amplification branch and the at least one auxiliary power amplification branch, an amplification signal that is output by the second amplification circuit (120); and

a first impedance inversion component (282), wherein the first impedance inversion component (282) is connected in series to the second main power amplifier (300),

the first power divider (430) comprises a second impedance inversion component (283) and a coupled transmission line (432), the second impedance inversion component (283) is connected between the output end of the second amplification circuit (120) and the input end of the main power amplification branch, and is configured to perform impedance inversion on the second amplification circuit (120), one end of the coupled transmission line (432) is connected to the input end of the at least one auxiliary power amplification branch, another end of the coupled transmission line (432) is grounded, and the first impedance inversion component and the second impedance inversion component are configured to perform impedance inversion on the second amplification circuit (120).


  2. The Doherty power amplifier according to claim 1, further comprising: at least one second phase compensation transmission line (281), disposed in the second main power amplification branch and/or the second auxiliary power amplification branch, and configured to adjust a phase difference between the second main power amplification branch and the second auxiliary power amplification branch.
  3. The Doherty power amplifier according to any one of claims 1 or 2, wherein the at least one stage of second auxiliary power amplifier is biased to a class B or a class C, and the second main power amplifier is biased to a class AB.
  4. The Doherty power amplifier according to any one of claims 1 to 3, wherein the at least one auxiliary power amplification branch comprises: one auxiliary power amplification branch, wherein multiple stages of auxiliary power amplifiers of the auxiliary power amplification branch are connected in series between an input end of the auxiliary power amplification branch and an output end of the auxiliary power amplification branch.
  5. The Doherty power amplifier according to any one of claims 1 to 3, further comprising: a third power divider (512), wherein the at least one auxiliary power amplification branch comprises:
multiple auxiliary power amplification branches, wherein an input end of the third power divider is coupled to an input end of the first main power amplifier (511) by using the first power divider (430), and the third power divider (512) is configured to allocate, to the multiple auxiliary power amplification branches, a signal that is output by the first power divider (430).
  6. The Doherty power amplifier according to any one of claims 1 to 3, wherein the at least one auxiliary power amplification branch comprises: a third power divider (713), one first-stage auxiliary power amplifier (712), and multiple second-stage auxiliary power amplifiers (714, 716), wherein an input end of the first-stage auxiliary power amplifier (712) is coupled to an input end of the first main power amplifier (711) by using the first power divider (430), an input end of the third power divider (713) is connected to an output end of the first-stage auxiliary power amplifier (712), and the third power divider (713) is configured to allocate, to the multiple second-stage auxiliary power amplifiers (714, 716), an amplification signal that is output by the first-stage auxiliary power amplifier (712).
  7. The Doherty power amplifier according to any one of claims 1 to 6, further comprising: at least one first phase compensation transmission line (280), disposed in the main power amplification branch and/or the at least one auxiliary power amplification branch, and configured to adjust a phase difference between the main power amplification branch and the at least one auxiliary power amplification branch.