Radio frequency power amplifier, remote radio unit, and base station

Abstract

This application discloses a radio frequency power amplifier, a remote radio unit, and a base station. The radio frequency power amplifier includes three amplifier branches. In this specification, two amplifier branches have narrow operating frequency bands and operate on frequency band A and frequency band B, respectively, and the other amplifier branch is designed to have a wide frequency band and operates on frequency band A+B. The radio frequency power amplifier further includes an inter-frequency power divider circuit and two circulators. The inter-frequency power divider circuit performs inter-frequency power division on the output signal of the wideband amplifier branch to output two narrowband signals, which are output after being power-combined by the circulator. Based on the technical solution of this application, a wideband problem is converted into a narrowband problem, thereby improving power amplification efficiency. In addition, the wideband amplifier branch provides a power distribution function, thereby processing high-power wideband signals. A narrowband isolator is used at a lower level of the circulator, thereby reducing the difficulty of designing the isolator.

Claims

1. A radio frequency power amplifier comprising a first amplification branch, a second amplification branch, a third amplification branch, a first circulator, a second circulator, and a first inter-frequency power division circuit, The input terminal of the first amplification branch is configured to connect to the first signal path, the input terminal of the second amplification branch is configured to connect to the second signal path, and the input terminal of the third amplification branch is configured to connect to the third signal path. The output terminal of the third amplification branch is connected to the input terminal of the first interfrequency power divider circuit. The operating frequency band of the first amplification branch and the first circulator is frequency band A, the operating frequency band of the second amplification branch and the second circulator is frequency band B, the operating frequency band of the third amplification branch is frequency band A and frequency band B, and the first inter-frequency power division circuit is configured to output frequency band A signals and frequency band B signals. The output terminal of the first amplification branch and the first output terminal of the first inter-frequency power division circuit are connected to different ports of the first circulator, and the first circulator is configured to perform power summing on the frequency band A signal output by the first amplification branch and the frequency band A signal output by the first inter-frequency power division circuit, and then output the result. The output terminal of the second amplification branch and the second output terminal of the first inter-frequency power division circuit are connected to different ports of the second circulator, and the second circulator is configured to perform power summing on the frequency band B signal output by the second amplification branch and the frequency band B signal output by the first inter-frequency power division circuit, and then output the result. Radio frequency power amplifier.

2. The output terminal of the first amplification branch is connected to the isolation port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the input port of the first circulator. The output terminal of the second amplification branch is connected to the isolation port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The radio frequency power amplifier according to claim 1.

3. The output terminal of the first amplification branch is connected to the input port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the isolation port of the first circulator. The output terminal of the second amplification branch is connected to the input port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the isolation port of the second circulator. The radio frequency power amplifier according to claim 1.

4. The output terminal of the first amplification branch is connected to the input port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the isolation port of the first circulator. The output terminal of the second amplification branch is connected to the isolation port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The radio frequency power amplifier according to claim 1.

5. The output terminal of the first amplification branch is connected to the isolation port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the input port of the first circulator. The output terminal of the second amplification branch is connected to the input port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the isolation port of the second circulator. The radio frequency power amplifier according to claim 1.

6. The first amplification branch, the second amplification branch, and the third amplification branch are, respectively, Single-transistor power amplifier, Doherty power amplifier, Chireix power amplifier, switching-adjusted Doherty power amplifier, load-modulated balance amplifier (LMBA), or circulator load-modulated amplifier (CLMA) A radio frequency power amplifier according to any one of claims 1 to 5, wherein the power amplifier is any one of the following:

7. The first amplification branch, the second amplification branch, and the third amplification branch each include a single-transistor power amplifier, The single-transistor power amplifier included in the first amplification branch is a first carrier power amplifier, The single-transistor power amplifier included in the second amplification branch is a second carrier power amplifier, The single-transistor power amplifier included in the third amplification branch is a Peak power amplifier. The radio frequency power amplifier according to claim 6.

8. The radio frequency power amplifier according to claim 6, wherein the first amplification branch and the second amplification branch each include the Doherty power amplifier, and the third amplification branch comprises the single-transistor power amplifier, the single-transistor power amplifier included in the third amplification branch is a Peak power amplifier.

9. The radio frequency power amplifier according to claim 6, wherein the first amplification branch, the second amplification branch, and the third amplification branch each include the Doherty power amplifier.

10. Further comprising a second inter-frequency power division circuit, power distributor, and phase compensation network, A radio frequency power amplifier according to any one of claims 1 to 5, wherein the first output terminal of the power distributor is connected to the input terminal of the second interfrequency power division circuit, the first and second output terminals of the second interfrequency power division circuit are connected to the first amplification branch and the second amplification branch, respectively, the second output terminal of the power distributor is connected to the first terminal of the phase compensation network, and the second terminal of the phase compensation network is connected to the third amplification branch.

11. It further includes a third inter-frequency power division circuit, The output terminals of the first circulator and the second circulator are connected to the first and second input terminals of the third inter-frequency power divider circuit, respectively. The third inter-frequency power division circuit outputs the signal obtained through power synthesis. A radio frequency power amplifier according to any one of claims 1 to 5.

12. Further comprising a first switch and a second switch, The antenna port of the first switch is connected to the isolation port of the first circulator, the receiving port of the first switch is connected to the corresponding receiving channel, and the transmitting port of the first switch is connected to the output terminal of the first amplification branch. The antenna port of the second switch is connected to the isolation port of the second circulator, the receiving port of the second switch is connected to the corresponding receiving channel, and the transmitting port of the second switch is connected to the second amplification branch. A radio frequency power amplifier according to any one of claims 1 to 5.

13. Further comprising a first switch and a second switch, The antenna port of the first switch is connected to the isolation port of the first circulator, the receiving port of the first switch is connected to the corresponding receiving channel, and the transmitting port of the first switch is connected to the first output terminal of the first inter-frequency power division circuit. The antenna port of the second switch is connected to the isolation port of the second circulator, the receiving port of the second switch is connected to the corresponding receiving channel, and the transmitting port of the second switch is connected to the second output terminal of the first inter-frequency power division circuit. A radio frequency power amplifier according to any one of claims 1 to 5.

14. A remote wireless unit comprising a radio frequency power amplifier and a duplexer, wherein one end of the radio frequency power amplifier is connected to the duplexer, The radio frequency power amplifier includes a first amplification branch, a second amplification branch, a third amplification branch, a first circulator, a second circulator, and a first inter-frequency power division circuit. The input terminal of the first amplification branch is configured to connect to the first signal path, the input terminal of the second amplification branch is configured to connect to the second signal path, and the input terminal of the third amplification branch is configured to connect to the third signal path. The output terminal of the third amplification branch is connected to the input terminal of the first interfrequency power divider circuit. The operating frequency band of the first amplification branch and the first circulator is frequency band A, the operating frequency band of the second amplification branch and the second circulator is frequency band B, the operating frequency band of the third amplification branch is frequency band A and frequency band B, and the first inter-frequency power division circuit is configured to output frequency band A signals and frequency band B signals. The output terminal of the first amplification branch and the first output terminal of the first inter-frequency power division circuit are connected to different ports of the first circulator, and the first circulator is configured to perform power summing on the frequency band A signal output by the first amplification branch and the frequency band A signal output by the first inter-frequency power division circuit, and then output the result. The output terminal of the second amplification branch and the second output terminal of the first inter-frequency power division circuit are connected to different ports of the second circulator, and the second circulator is configured to perform power summing on the frequency band B signal output by the second amplification branch and the frequency band B signal output by the first inter-frequency power division circuit, and then output the result. Remote wireless unit.

15. The output terminal of the first amplification branch is connected to the isolation port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the input port of the first circulator. The output terminal of the second amplification branch is connected to the isolation port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The remote wireless unit according to claim 14.

16. The output terminal of the first amplification branch is connected to the input port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the isolation port of the first circulator. The output terminal of the second amplification branch is connected to the input port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the isolation port of the second circulator. The remote wireless unit according to claim 14.

17. The output terminal of the first amplification branch is connected to the input port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the isolation port of the first circulator. The output terminal of the second amplification branch is connected to the isolation port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The remote wireless unit according to claim 14.

18. The output terminal of the first amplification branch is connected to the isolation port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the input port of the first circulator. The output terminal of the second amplification branch is connected to the input port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The remote wireless unit according to claim 14.

19. A base station comprising a remote wireless unit and an antenna, The remote wireless unit is connected to the antenna, The remote wireless unit is configured to process the received and transmitted signals of the antenna. The remote wireless unit includes a radio frequency power amplifier and a duplexer, one end of the radio frequency power amplifier is connected to the duplexer, The radio frequency power amplifier includes a first amplification branch, a second amplification branch, a third amplification branch, a first circulator, a second circulator, and a first inter-frequency power division circuit. The input terminal of the first amplification branch is configured to connect to the first signal path, the input terminal of the second amplification branch is configured to connect to the second signal path, and the input terminal of the third amplification branch is configured to connect to the third signal path. The output terminal of the third amplification branch is connected to the input terminal of the first interfrequency power divider circuit. The operating frequency band of the first amplification branch and the first circulator is frequency band A, the operating frequency band of the second amplification branch and the second circulator is frequency band B, the operating frequency band of the third amplification branch is frequency band A and frequency band B, and the first inter-frequency power division circuit is configured to output frequency band A signals and frequency band B signals. The output terminal of the first amplification branch and the first output terminal of the first inter-frequency power division circuit are connected to different ports of the first circulator, and the first circulator is configured to perform power summing on the frequency band A signal output by the first amplification branch and the frequency band A signal output by the first inter-frequency power division circuit, and then output the result. The output terminal of the second amplification branch and the second output terminal of the first inter-frequency power division circuit are connected to different ports of the second circulator, and the second circulator is configured to perform power summing on the frequency band B signal output by the second amplification branch and the frequency band B signal output by the first inter-frequency power division circuit, and then output the result. Base station.

20. The output terminal of the first amplification branch is connected to the isolation port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the input port of the first circulator. The output terminal of the second amplification branch is connected to the isolation port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The base station according to claim 19.

21. The output terminal of the first amplification branch is connected to the input port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the isolation port of the first circulator. The output terminal of the second amplification branch is connected to the input port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the isolation port of the second circulator. The base station according to claim 19.

22. The output terminal of the first amplification branch is connected to the input port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the isolation port of the first circulator. The output terminal of the second amplification branch is connected to the isolation port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the input port of the second circulator. The base station according to claim 19.

23. The output terminal of the first amplification branch is connected to the isolation port of the first circulator, and the first output terminal of the first interfrequency power division circuit is connected to the input port of the first circulator. The output terminal of the second amplification branch is connected to the input port of the second circulator, and the second output terminal of the first interfrequency power division circuit is connected to the isolation port of the second circulator. The base station according to claim 19.

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