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Method and device for improving linear efficiency of Doherty power amplifier

An efficient and linear technology, applied in the field of improving the linear efficiency of Doherty power amplifiers, can solve the problems of low efficiency of Doherty power amplifiers, and achieve the effect of improving power amplifier efficiency and high power amplifier efficiency

Pending Publication Date: 2020-04-21
HENGXIN SEMITECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

As mentioned above, the Doherty power amplifier improves the efficiency when the signal amplitude is close to the average power, but when the signal amplitude deviates from the average power, the efficiency of the Doherty power amplifier is still low, and there is still room for improvement in power amplifier efficiency

Method used

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  • Method and device for improving linear efficiency of Doherty power amplifier
  • Method and device for improving linear efficiency of Doherty power amplifier

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Embodiment 1

[0034] refer to figure 1 As shown, an embodiment of the present invention provides a method for improving the linear efficiency of the Doherty power amplifier, including:

[0035] S1. Divide the input signal into two channels, one is the main power amplifier with 8 branches, the other is the auxiliary power amplifier with 9 branches, the input signal enters the main power amplifier 8 and the auxiliary power amplifier 9 through the input power divider 1 and the phase compensation network 7;

[0036] S2. The input signal of the coupling part enters the envelope sampler 2 to sample the envelope of the input signal;

[0037] S3. According to the envelope of the input signal obtained by the envelope sampler 2, the voltage modulator 3 modulates the voltages of the main power amplifier 8 and the auxiliary power amplifier 9 according to the voltage modulation rules, and implements the corresponding signal by comparing the relationship between the signal amplitude and the cumulative av...

Embodiment 2

[0042] refer to figure 2As shown, another embodiment of the present invention provides a device for improving the linear efficiency of Doherty power amplifier, including input power divider 1, envelope sampler 2, voltage modulator 3, output combiner 4, phase compensation and delay Time network 5, impedance converter 6 and phase compensation network 7, each part of the device is described in detail below: input power divider 1 is used to divide the input signal into two paths and input them to the main power amplifier 8 branches respectively and auxiliary power amplifier 9 branches; the envelope sampler 2 is used to perform envelope sampling on the input signal coupled at the current moment; the voltage modulator 3 is used to obtain the envelope of the input signal according to the envelope sampler 2, and according to the voltage modulation rule Modulate the voltage of the main power amplifier 8 and the auxiliary power amplifier 9; the output combiner 4 is used to realize the ...

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Abstract

The invention discloses a method and device for improving the linear efficiency of a Doherty power amplifier, and the method comprises the steps that an input power divider enables an input signal tobe divided into two paths of input, one path is a main power amplifier branch, and the other path is an auxiliary power amplifier branch; a coupling part of an input signal enters an envelope samplerto sample the envelope of the input signal; according to the input signal envelope obtained by an envelope sampler, the voltage modulator modulates the voltage of the main power amplifier and the auxiliary power amplifier according to a voltage modulation rule; signals on the main power amplifier branch and the auxiliary power amplifier branch are amplified by the main power amplifier and the auxiliary power amplifier and then output through the output combiner. According to the invention, the voltages of the main power amplifier and the auxiliary power amplifier of the Doherty power amplifierare modulated according to the voltage modulation rule of the voltage modulator; the amplitude of the Doherty power amplifier is changed along with the amplitude of an input signal, so that the poweramplifier always works in a high-efficiency region, the power amplifier efficiency is remarkably improved, and the highest Doherty power amplifier efficiency can be obtained in a relatively large power range.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and a device for improving the linear efficiency of a Doherty power amplifier. Background technique [0002] In order to improve the coverage of the wireless communication system, it is necessary to use a power amplifier to amplify the signal of the communication system and output it to the antenna. When the power amplifier is working, as the output power increases, the efficiency gradually increases, and the efficiency reaches the highest when it reaches saturation. In order to improve the information transmission rate, modern wireless communication systems use modulation signals with high peak-to-average ratio. In order to avoid signal distortion and affect the accuracy of information transmission, the power amplifier in the communication system needs to work in a fallback state. [0003] In order to improve the fallback efficiency of power amplifiers,...

Claims

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Application Information

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IPC IPC(8): H03F1/07
CPCH03F1/07Y02D30/70
Inventor 史伟强
Owner HENGXIN SEMITECH CO LTD
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