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1. US20170077875 - Doherty power amplifier and transmitter

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

[ EN ]

Claims

1. A Doherty power amplifier, comprising:
a first amplification circuit, 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, each auxiliary power amplification branch of the at least one auxiliary power amplification branch comprises multiple levels of auxiliary power amplifiers, 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 configured 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 reaches a first threshold;
a delay device, 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 combined network, configured to: perform impedance inversion on the first amplification circuit, 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, 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 to the main power amplification branch and the at least one auxiliary power amplification branch; and
a third power divider, 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 by the first power divider, and the third power divider is configured to allocate, to the multiple auxiliary power amplification branches, a signal that is output by the first power divider.
2. A Doherty power amplifier, comprising:
a first amplification circuit, 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, each auxiliary power amplification branch of the at least one auxiliary power amplification branch comprises multiple levels of auxiliary power amplifiers, 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 reaches a first threshold;
a delay device, 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 combined network, configured to: perform impedance inversion on the first amplification circuit, 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, 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 to the main power amplification branch and the at least one auxiliary power amplification branch;
a second amplification circuit, 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, the second auxiliary power amplification branch comprises at least one level of second auxiliary power amplifier, the second main power amplification branch is configured to output an amplification signal to an output end of the second amplification circuit, to drive the first main power amplifier, and the second auxiliary power amplification branch is configured to output an amplification signal to the output end of the second amplification circuit when an output power of the second main power amplifier reaches a second threshold; and
a second power divider, 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 is coupled between the first amplification circuit and the second amplification circuit, 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.
3. The Doherty power amplifier according to claim 2, further comprising: a first impedance inversion component and a second impedance inversion component that are configured to perform impedance inversion on the second amplification circuit, wherein the first impedance inversion component is connected in series to the second main power amplifier, and the second impedance inversion component is connected between the first power divider and the first impedance inversion component.
4. The Doherty power amplifier according to claim 2, further comprising: a first impedance inversion component, wherein the first impedance inversion component is connected in series to the second main power amplifier, the first power divider comprises a second impedance inversion component and a coupled transmission line, the second impedance inversion component is connected between the output end of the second amplification circuit and the input end of the main power amplification branch, and is configured to perform impedance inversion on the second amplification circuit, one end of the coupled transmission line is connected to the input end of the at least one auxiliary power amplification branch, another end of the coupled transmission line 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.
5. The Doherty power amplifier according to claim 2, further comprising: at least one second phase compensation transmission line, disposed in the second main power amplification branch and 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.
6. The Doherty power amplifier according to claim 2, wherein the at least one level 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.
7. The Doherty power amplifier according to claim 1, wherein the first power divider is a coupler.
8. The Doherty power amplifier according to claim 1, wherein the at least one auxiliary power amplification branch comprises: one auxiliary power amplification branch, wherein the multiple levels 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.
9. A Doherty power amplifier, comprising:
a first amplification circuit, 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, each auxiliary power amplification branch of the at least one auxiliary power amplification branch comprises multiple levels of auxiliary power amplifiers, 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 reaches a first threshold;
a delay device, 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 combined network, configured to: perform impedance inversion on the first amplification circuit, 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, 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 to the main power amplification branch and the at least one auxiliary power amplification branch, wherein the at least one auxiliary power amplification branch comprises: a third power divider, one first-level auxiliary power amplifier, and multiple second-level auxiliary power amplifiers, wherein an input end of the first-level auxiliary power amplifier is coupled to an input end of the first main power amplifier by the first power divider, an input end of the third power divider is connected to an output end of the first-level auxiliary power amplifier, and the third power divider is configured to allocate, to the multiple second-level auxiliary power amplifiers, an amplification signal that is output by the first-level auxiliary power amplifier.
10. The Doherty power amplifier according to claim 1, further comprising: at least one first phase compensation transmission line, disposed in the main power amplification branch and 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.
11. The Doherty power amplifier according to claim 1, wherein the multiple levels of auxiliary power amplifiers are biased to the class B or the class C, and the first main power amplifier is biased to the class AB.
12. The Doherty power amplifier according to claim 1, wherein the combiner network comprises: at least one impedance inverter, and the delay device is a delay line.
13. A Doherty power amplifier, comprising:
a first amplification circuit, 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, each auxiliary power amplification branch of the at least one auxiliary power amplification branch comprises multiple levels of auxiliary power amplifiers, 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 configured 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 reaches a first threshold;
a combiner network, configured to: perform impedance inversion on the first amplification circuit, 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 second amplification circuit, 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, the second auxiliary power amplification branch comprises at least one level of second auxiliary power amplifier, the second main power amplification branch is configured to output an amplification signal to an output end of the second amplification circuit, to drive the first main power amplifier, and the second auxiliary power amplification branch is configured to output an amplification signal to the output end of the second amplification circuit when an output power of the second main power amplifier reaches a second threshold;
a first power divider, coupled between the first amplification circuit and the second amplification circuit, and configured to allocate an input signal of the first power divider to the main power amplification branch and the at least one auxiliary power amplification branch; and
a second power divider, 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.
14. The Doherty power amplifier according to claim 13, further comprising: a first impedance inversion component and a second impedance inversion component that are configured to perform impedance inversion on the second amplification circuit, wherein the first impedance inversion component is connected in series to the second main power amplifier, and the second impedance inversion component is connected between the first power divider and the first impedance inversion component.
15. The Doherty power amplifier according to claim 13, further comprising: a first impedance inversion component, wherein the first impedance inversion component is connected in series to the second main power amplifier, the first power divider comprises a second impedance inversion component and a coupled transmission line, the second impedance inversion component is connected between the output end of the second amplification circuit and an input end of the main power amplification branch, and is configured to perform impedance inversion on the second amplification circuit, one end of the coupled transmission line is connected to an input end of the at least one auxiliary power amplification branch, another end of the coupled transmission line 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.
16. The Doherty power amplifier according to claim 14, wherein the at least one level 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.
17. The Doherty power amplifier according to claim 13, wherein the first power divider is a coupler.
18. The Doherty power amplifier according to claim 13, wherein the multiple levels of auxiliary power amplifiers are biased to the class B or the class C, and the first main power amplifier is biased to the class AB.
19. The Doherty power amplifier according to claim 2, wherein the combiner network comprises at least one impedance inverter, and the delay device is a delay line.