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Doherty power amplifier based on transformer

一种功率放大器、放大器的技术，应用在功率放大器、带有半导体器件/放电管的放大器、直流耦合的直流放大器等方向，能够解决饱和输出功率和功率回退区间线性度不是很好等问题，达到提高线性度的效果

Active Publication Date: 2019-06-28
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the transformer-based Doherty PA can obtain high efficiency in the power back-off range of 6dB, its linearity between the saturated output power and the power back-off range is not very good, and needs to be optimized

Method used

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  • Doherty power amplifier based on transformer
  • Doherty power amplifier based on transformer
  • Doherty power amplifier based on transformer

Examples

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Embodiment Construction

[0062] Existing transformer-based Doherty PAs:

[0063] Such as Figure 5 Shown is a schematic structural diagram of an existing transformer-based Doherty PA. The existing transformer-based Doherty power amplifier includes a main power amplifier path and an auxiliary power amplifier path, and the main power amplifier path and the auxiliary power amplifier path are connected in parallel.

[0064] The main power amplifier path includes a main power amplifier 302 , and the auxiliary power amplifier path includes an auxiliary power amplifier 304 .

[0065] The main power amplifier path also includes a main driving amplifier 301, the output of the main driving amplifier 301 is connected to the input of the main power amplifier 302, and the input of the main driving amplifier 301 is connected to the radio frequency input signal RFIN, so The output terminal of the main power amplifier 302 outputs a radio frequency output signal RFOUT.

[0066] The auxiliary power amplifier path als...

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Abstract

The invention discloses a Doherty power amplifier based on a transformer. The Doherty power amplifier comprises a main power amplifier path and an auxiliary power amplifier path which are connected inparallel. The main power amplifier path comprises a main power amplifier, and the auxiliary power amplifier path comprises an auxiliary power amplifier. The circuit also comprises a first linearization network circuit or a second linearization network circuit. The first linear network circuit is arranged at the input end of the main power amplifier and is used for compensating the change of the input capacitance of the main power amplifier and improving the linearity of the main power amplifier. The second linearization network circuit is arranged at the input end of the auxiliary power amplifier and is used for compensating the change of the input capacitance of the auxiliary power amplifier and improving the linearity of the auxiliary power amplifier. According to the invention, the linearity of the Doherty power amplifier can be improved.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a transformer-based Doherty power amplifier (PA). Background technique [0002] Today's advanced wireless standards use Orthogonal Frequency Division Multiplexing (OFDM) modulation to increase the data rate, but in this modulation, when multiple waves are multiplexed, waves with the same initial phase are easy to superimpose As a result, the instantaneous power is increased, so that the peak-to-average ratio (PAPR) is very large, and a larger PAPR increases the dynamic range of the power amplifier, making the nonlinearity of the PA worse. In order to improve the influence of PAPR on the nonlinearity of the PA, the Power Back-off method is usually used for setting. The Power Back-off method is to back off the input power of the power amplifier by 6-10 decibels from the 1dB compression point. The 1dB compression point is equivalent to the critical point of the linear region an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/32H03F3/193H03F3/21H03F3/45
CPCH03F1/0288H03F2200/534H03F2200/541H03F3/45475H03F3/45188Y02D30/70H03F3/211
Inventor 任江川戴若凡
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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