Doherty power amplifier and multi-frequency band signal parameter adjusting device

Abstract

The embodiment of the invention discloses a Doherty power amplifier which comprises a power divider, a multi-frequency band carrier power amplifier, a multi-frequency band peak power amplifier, a first Lambda / 4 impedance transformer and a second Lambda / 4 impedance transformer, wherein the power divider is used for dividing the received signals into a first path of signals and a second path of signals; the multi-frequency band carrier power amplifier is used for amplifying the signals output by the power divider and then transmitting the signals the input end of the first Lambda / 4 impedance transformer; the multi-frequency band peak power amplifier is used for amplifying the second path of signals output by the power divider and then outputting the signals; the first Lambda / 4 impedance transformer supports multiple frequency band ranges, and is used for impedance matching between the load impedance of the first Lambda / 4 impedance transformer and the output impedance of the multi-frequency band carrier power amplifier through impedance conversion; and the second Lambda / 4 impedance transformer is used for impedance matching between the input impedance of the second Lambda / 4 impedancetransformer and the load impedance of the Doherty power amplifier through the impedance conversion. The Doherty power amplifier of the invention supports multi-frequency band operation, has high efficiency, and can lower the power consumption of the system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a Doherty power amplifier and a multi-band signal parameter adjustment device. Background technique [0002] For the transmitting equipment of the wireless communication system, the power amplifier has always been a research hotspot. The reason is that the linearity and efficiency of the power amplifier directly affect the efficiency and structure of the system. In order to reduce the power consumption of the digital communication system, some high-efficiency power amplifier technologies are adopted by the base station transmission equipment of the modern wireless communication system, and the Doherty power amplifier based on the Doherty technology is one of them. [0003] The Doherty power amplifier can be applied to a base station system supporting multiple frequency bands (hereinafter referred to as a multi-band base station). In the prior art, a Doherty power ...

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Problems solved by technology

[0004] However, the impedance converter in the existing Doherty power amplifier is a narrow-band device, and its bandwidth determines that this impedance converter is actually not suitable for multi-band base stations, especially when the frequency bands are far apart, the narrower bandwidth of the device will make it The impedance at both ends is difficult to match, which severely limits the performance of the Dohetry power amplifier; further, due to the limitation of the active device technology, it is difficult to achieve the same amplitude-frequency and phase-frequency characteristics of the active devices in the Doherty power amplifier. The amplitude and phase in a relatively wide frequency range usually have relatively large fluctuations. These characteristics of active devices determine that the signal path where the carrier power amplifier and peak power amplifier are located in the existing Doherty power amplifier is difficult to achieve in multiple frequency bands Maintain the amplitude and phase characteristics required by Doherty amplifiers

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