A doherty power amplifier

A power amplifier and power divider technology, applied in power amplifiers, improving amplifiers to expand bandwidth, improving amplifiers to improve efficiency, etc., can solve the problem of output impedance distribution dispersion, affecting the power and efficiency of Doherty power amplifiers, carrier amplifier power leakage, etc. problems, to achieve the effect of increasing the operating bandwidth, improving output power and efficiency, and reducing power leakage

Active Publication Date: 2018-03-27
JIANGSU UNIV
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Problems solved by technology

[0004] Through research, it is found that in the traditional Doherty power amplifier, the peak amplifier keeps the output impedance high within the working bandwidth through the peak compensation line. However, the longer the peak compensation line, the more dispersed the output impedance distribution within the bandwidth and deviates from the center frequency. The farther away, the more severe the change of impedance will cause the power leakage of the carrier amplifier, which will affect the power and efficiency of the Doherty power amplifier when it backs off

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Embodiment Construction

[0018] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 Shown, the present invention is a kind of Doherty power amplifier that adopts novel peak output matching network, comprises power splitter 1, carrier amplifier circuit 2, peak amplifier circuit 8 and combiner 13; Described carrier amplifier circuit 2 is made up of carrier phase compensation line 3. Carrier IMN (input matching network) 4, carrier amplifier 5, carrier OMN (output matching network) 6 and carrier compensation line 7 are sequentially connected in series to form; Matching network) 10, peak amplifier 11 and peak OMN (output matching network) 12 are sequentially connected in series to form; the combiner 13 includes a characteristic impedance of 35 ohms λ / 4 impedance conversion line 14, connected to the carrier amplifier circuit 2 and the signal output terminal of the peak amplifying circuit 8, wherein λ is t...

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Abstract

The invention discloses a Doherty power amplifier, which comprises a power divider, a carrier amplifier circuit, a peak amplifier circuit and a combiner. The carrier amplifier circuit comprises a carrier phase delay line, a carrier amplifier and a carrier compensation line. The peak amplifier circuit comprises a peak phase delay line and a peak amplifier. The power divider equally outputs an input signal to the carrier amplifier circuit and the peak amplifier circuit. In comparison with the conventional Doherty power amplifier, the Doherty power amplifier adopting the novel peak amplifier has the advantages that, through optimization design of an output matching network of the peak amplifier, an output end of the peak amplifier is guaranteed to be at high impedance in a working bandwidth without using a peak compensation line, so that the power leakage caused by the carrier amplifier circuit is reduced, the wider bandwidth is realized, and the output power and the backspace efficiency are improved, and the Doherty power amplifier can be applied to a future broadband wireless communication system.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a Doherty power amplifier using a novel peak amplifier output matching network. Background technique [0002] With the development of science and technology, modern wireless communication systems are developing towards higher bandwidth, faster speed and higher efficiency. Communication systems place high demands. Modulated signals in modern communication systems have a higher peak-to-average ratio, so the power amplifier is required to work at a higher power back-off point to ensure the linearity of the signal, but the efficiency of the power amplifier will be significantly reduced. [0003] In order to adapt to the peak-to-average ratio of the modulated signal, the design of the power amplifier requires the power amplifier to maintain a high efficiency when the power is backed off. The Doherty power amplifier can have a high efficiency when the power is backed off, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/07H03F1/42H03F3/20
Inventor 杨利霞郭鹏良夏景孔娃
Owner JIANGSU UNIV
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