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load modulation power amplifier

A power amplifier and load modulation technology, which is applied in the direction of power amplifiers, can solve the problem of harsh conditions for the best performance of power amplifiers

Active Publication Date: 2018-07-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above problems, the present invention provides a load modulation power amplifier to solve the problem that the power amplifiers in the prior art have strict conditions for achieving the best performance

Method used

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Embodiment 1

[0024] This embodiment provides a load modulation power amplifier, which includes a power distribution circuit, a power amplifier circuit, a load pre-matching circuit and a load resistor R connected in series in sequence. L0 , The load resistor can be a 50 ohm resistor.

[0025] where the load pre-matching circuit is used to place R L0 Converts to a modulating impedance, which is modulated by the load modulation effect to Z at low power input 1T , at high power input the load modulation effect modulates the modulation impedance to 2Z 1T , where Z 1T =R L +jX L .

[0026] Here we call Z 1T Modulate impedance for the first load, called 2Z 1T The impedance is modulated for the second load.

[0027] The improvement of this embodiment over the prior art lies in that the imaginary part X is introduced into the load modulation impedance through the load pre-matching circuit L , so that when calculating the conditions for the power amplifier to achieve the best performance, t...

Embodiment 2

[0030] The present embodiment further defines on the basis of above-mentioned embodiment 1:

[0031] The power amplifier circuit includes a main power amplifier branch and an auxiliary power amplifier branch connected in parallel.

[0032] The power distribution circuit distributes the input power to the main power amplifier branch and the auxiliary power amplifier branch. Usually, the distribution ratio is 1:1, and the best power back-off efficiency can be obtained when the saturated power backs off by 6dB. The output current of the main power amplifier branch is I 1 , the output circuit of the auxiliary power amplifier branch is I 2 , I 1 and I 2 The phases are the same, the magnitudes are the same, and they flow through the load pre-matching circuit together.

[0033] The main power amplifier branch includes a first power die and a two-point matching circuit, and the two-point matching circuit is connected between the output terminal of the first power die and the load ...

Embodiment 3

[0057] On the basis of the above-mentioned embodiment 2, the present embodiment further defines:

[0058] The main power amplifier branch also includes a first input matching network connected to the input end of the first power die, and the first input matching network is used to match the source impedance to the optimal source required by the first power die. Impedance Z M，opt，S .

[0059] The auxiliary power amplifier branch also includes a second input matching network connected to the input terminal of the second power die, and the second input matching network is used to match the source impedance to the optimal source required by the second power die Impedance Z A，opt，S .

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Abstract

The invention discloses a load modulation power amplifier, which mainly aims at the problem that the power amplifier in the prior art has strict conditions for realizing the best performance. The load modulation power amplifier includes a power distribution circuit, a power amplifier circuit, a load pre-matching circuit and a load resistance RLO connected in series in sequence; wherein the load pre-matching circuit is used to convert RLO into a modulation impedance, and the load modulation effect is achieved when low power input The modulation impedance is converted to Z1T, and the load modulation effect converts the modulation impedance to 2Z1T at high power input, where Z1T=RL+jXL. The present invention introduces the imaginary part XL into the load modulation impedance through the load pre-matching circuit, so that the free variables containing RL and XL are added when calculating the conditions for the power amplifier to achieve the best performance, thereby weakening the load modulation power amplifier to achieve the best performance. conditions for optimum performance.

Description

technical field [0001] The invention relates to a load modulation power amplifier. Background technique [0002] With the wide application of wireless communication, in order to obtain better communication performance, the modulation mode of the power amplifier becomes more and more complicated, and the peak-to-average ratio of the modulated signal increases continuously. In order to minimize the impact of the signal band on the transmitter’s transmission performance, the final power amplifier module of the transmitter often needs to work in a power back-off state, which leads to a low actual working efficiency of the power amplifier and often cannot meet the application requirements. . [0003] The power amplifier of the Doherty structure is a typical power amplifier that can improve the power back-off efficiency, so it is widely used in advanced communication systems such as 3G and 4G. The key point of the Doherty power amplifier is the application of the principle of lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20
Inventor 彭亚涛付军王玉东崔杰崔文普
Owner TSINGHUA UNIV
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