Millimeter-wave dual-frequency Doherty power amplifier based on single frequency line

Abstract

The invention provides a millimeter-wave dual-frequency Doherty power amplifier based on a single frequency line. The millimeter-wave dual-frequency Doherty power comprises a dual-frequency power divider, a primary power amplifier dual-frequency input matching network, a secondary power amplifier dual-frequency input matching network, a primary power amplifier tube, a secondary power amplifier tube, a primary power amplifier dual-frequency output matching network, a secondary power amplifier dual-frequency output matching network, and a dual-frequency post matching network, wherein the dual-frequency power divider is connected with the primary power amplifier dual-frequency input matching network through a first single-frequency transmission line of a first preset length; the primary power amplifier dual-frequency output matching network is connected with the dual-frequency post matching network through a second single-frequency transmission line of a second preset length; and the secondary power amplifier dual-frequency output matching network is connected with the dual-frequency post matching network through a third single-frequency transmission line of a third preset length. Through adoption of the millimeter-wave dual-frequency Doherty power amplifier, a dual-frequency phase shift function is realized by an ordinary single-frequency transmission line, so that the problems of large size, great loss and small bandwidth in a conventional dual-frequency transmission line on a millimeter-wave band are solved, and the performance of a dual-frequency phase shift line can be enhanced greatly.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a millimeter-wave dual-frequency Doherty power amplifier based on a single-frequency line. Background technique [0002] In modern communication systems, frequency resources are one of the most scarce resources. In order to improve spectrum utilization, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing), CDMA (Code Division Multiple Access, Code Division Multiple Access) are often used address technology) and other modern modulation methods. However, while improving spectrum utilization, these modern modulation methods also bring about a problem of peak-to-average power ratio (PAPR, Peak to Average Power Ratio). Such a high PAPR brings difficulties to the design of the radio frequency front end, especially the radio frequency power amplifier, and especially has an adverse effect on the efficiency index of the power amplifie...

AI Technical Summary

Problems solved by technology

Although these structures can achieve the effect of dual-frequency phase shift, they are usually large in size, the line width may be unreasonable, and the bandwidth is very narrow. These problems limit their application in the millimeter wave band

Due to the strong distributed parameter effect, the millimeter-wave power amplifier must be realized by integrated circuit technology, and the larger dual-frequency line size means a larger chip area, which greatly increases the processing cost

In addition, the loss of passive components in the millimeter wave frequency band is large. If the size of the dual-band line is large, the loss introduced by it will seriously reduce the performance of the power amplifier. When the line width is unreasonable, the impact will be more obvious.

There are usually processing errors in integrated circuit technology, and the narrow bandwidth of the dual-frequency line will cause the actual dual-frequency phase shift to seriously deviate from the design value, so that the actual processed dual-frequency Doherty power amplifier cannot achieve dual-frequency performance

Therefore, the difficulty in the realization of millimeter-wave dual-frequency Doherty power amplifiers lies in the realization of high-performance dual-frequency phase-shift lines. With the acceleration of 5G communication process, this problem needs to be solved urgently

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