Power amplifier and electronic device including the same

Patent metadata

Field	Value
Publication number	US-2023198480-A1
Application number	US-202318168223-A
Country	US
Kind code	A1
Filing date	Feb 13, 2023
Priority date	Dec 1, 2021
Publication date	Jun 22, 2023
Grant date	—

Abstract

The disclosure relates to a 5th generation (5G) or a pre-5G communication system for supporting a higher data transmission rate after a 4th generation (4G) communication system such as long-term evolution (LTE). A Doherty power amplifier of a wireless communication system is provided. The Doherty power amplifier includes a first power amplifier, a second power amplifier, a first transmission line connected to an output end of the first power amplifier, a second transmission line connected to an input end of the second power amplifier, a first network, and a second network, the first network may interconnect a first node connected with one end of the first transmission line and a second node connected with an output end of the second power amplifier, the one end of the first transmission line may be positioned on an opposite side with respect to the output end of the first power amplifier, and the second network may connect the first node, the second node, and a third node which is an output end of the Doherty power amplifier.

First claim

What is claimed is:

1 . A Doherty power amplifier of a wireless communication system, the Doherty power amplifier comprising:
a first power amplifier; a second power amplifier; a first transmission line connected to an output end of the first power amplifier; a second transmission line connected to an input end of the second power amplifier; a first network; and a second network, wherein the first network interconnects a first node connected with one end of the first transmission line and a second node connected with an output end of the second power amplifier, wherein the one end of the first transmission line is positioned on an opposite side with respect to the output end of the first power amplifier, and wherein the second network connects the first node, the second node, and a third node which is an output end of the Doherty power amplifier.

2 . The Doherty power amplifier of claim 1 ,
wherein the first power amplifier is a class-AB power amplifier, and wherein the second power amplifier is a class-C power amplifier.

3 . The Doherty power amplifier of claim 1 , wherein the first network comprises at least one of a lumped element, a distributed element, or a combination of the lumped element and the distributed element.

4 . The Doherty power amplifier of claim 1 ,
wherein the second network comprises a third transmission line and a fourth transmission line, wherein the third transmission line is connected with the first node, wherein the fourth transmission line is connected with the second node, and wherein the third transmission line and the fourth transmission line are connected with the third node at an arbitrary point.

5 . The Doherty power amplifier of claim 4 , wherein, in case that the first power amplifier and the second power amplifier operate with maximum output power, a characteristic impedance ratio of the third transmission line and the fourth transmission line is determined based on a maximum output power ratio of the first power amplifier and the second power amplifier.

6 . The Doherty power amplifier of claim 4 , wherein, in case that the second power amplifier does not operate, an electrical length of the first transmission line and a reactance value of the first network are determined based on a maximum output power ratio of the first power amplifier and the second power amplifier and a modulation rate of load impedance of the first power amplifier.

7 . The Doherty power amplifier of claim 1 , wherein the second network comprises a first transformer interconnecting the first node and the third node and a second transformer interconnecting the second node and the third node.

8 . The Doherty power amplifier of claim 7 , wherein, in case that the first power amplifier and the second power amplifier operate with maximum output power, a first turns ratio of the first transformer and a second turns ratio of the second transformer are determined based on characteristic impedance of the first transmission line, load impedance of the Doherty power amplifier and a maximum output power ratio of the first power amplifier and the second power amplifier.

9 . The Doherty power amplifier of claim 7 , wherein, in case that the second power amplifier does not operate, an electrical length of the first transmission line and a reactance value of the first network are determined based on a maximum output power ratio of the first power amplifier and the second power amplifier and a modulation rate of load impedance of the first power amplifier.

10 . The Doherty power amplifier of claim 1 , wherein an electrical length of the first transmission line is equal to an electrical length of the second transmission line.

11 . An electronic device of a wireless communication system, the electronic device comprising:
at least one processor; a plurality of radio frequency (RF) chains connected with the at least one processor; and a plurality of antenna elements connected with the plurality of the RF chains, wherein a first RF chain of the plurality of the RF chains comprises a Doherty power amplifier, wherein the Doherty power amplifier comprises:
a first power amplifier, a second power amplifier, a first transmission line connected to an output end of the first power amplifier, a second transmission line connected to an input end of the second power amplifier, a first network and a second network,
wherein the first network interconnects a first node connected with one end of the first transmission line and a second node connected with an output end of the second power amplifier, wherein the one end of the first transmission line is positioned on an opposite side with respect to the output end of the first power amplifier, and wherein the second network connects the first node, the second node, and a third node which is an output end of the Doherty power amplifier.

12 . The electronic device of claim 11 ,
wherein the first power amplifier is a class-AB power amplifier, and wherein the second power amplifier is a class-C power amplifier.

13 . The electronic device of claim 11 , wherein the first network comprises at least one of a lumped element, a distributed element, or a combination of the lumped element and the distributed element.

14 . The electronic device of claim 11 ,
wherein the second network comprises a third transmission line and a fourth transmission line, wherein the third transmission line is connected with the first node, wherein the fourth transmission line is connected with the second node, and wherein the third transmission line and the fourth transmission line are connected with the third node at an arbitrary point.

15 . The electronic device of claim 14 , wherein, in case that the first power amplifier and the second power amplifier operate with maximum output power, a characteristic impedance ratio of the third transmission line and the fourth transmission line is determined based on a maximum output power ratio of the first power amplifier and the second power amplifier.

16 . The electronic device of claim 14 , wherein, in case that the second power amplifier does not operate, an electrical length of the first transmission line and a reactance value of the first network are determined based on a maximum output power ratio of the first power amplifier and the second power amplifier and a modulation rate of load impedance of the first power amplifier.

17 . The electronic device of claim 11 , wherein the second network comprises a first transformer interconnecting the first node and the third node and a second transformer interconnecting the second node and the third node.

18 . The electronic device of claim 17 , wherein, in case that the first power amplifier and the second power amplifier operate with maximum output power, a first turns ratio of the first transformer and a second turns ratio of the second transformer are determined based on characteristic impedance of the first transmission line, load impedance of the Doherty power amplifier and a maximum output power ratio of the first power amplifier and the second power amplifier.

19 . The electronic device of claim 17 , wherein, in case that the second power amplifier does not operate, an electrical length of the first transmission line and a reactance value of the first network are determined based on a maximum output power ratio of the first power amplifier and the second power amplifier and a modulation rate of load impedance of the first power amplifier.

20 . The electron

Assignees

• Samsung Electronics Co Ltd
• Research & Business Found Sungkyunkwan Univ

Inventors

• Jee Seunghoon
• Yang Youngoo
• Chen Yifei
• Kang Hyunuk
• Kim Kyoungtae
• Kim Changwook
• Woo Youngyoon
• Choi Woojin

Classifications

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H03F3/211 Primary

  using a combination of several amplifiers (H03F3/60 takes precedence) · CPC title

• H03F2200/387

  A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier · CPC title

• H03F1/0288 Primary

  using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers · CPC title

• H03F1/565

  using inductive elements · CPC title