Doherty radio frequency power amplifier module based on novel DreaMOS technology and output matching network of Doherty radio frequency power amplifier module

Abstract

The invention discloses a Doherty radio frequency power amplifier module based on a novel DreaMOS technology and an output matching network of the Doherty radio frequency power amplifier module. The output matching network comprises a main parasitic capacitor, an auxiliary parasitic capacitor and an inductor, one end of the main parasitic capacitor is connected with a drain electrode of a main path amplifier, and the other end of the main parasitic capacitor is connected with the inductor; one end of the auxiliary stray capacitor is connected with a drain electrode of the auxiliary circuit amplifier, the other end of the auxiliary stray capacitor is connected with the inductor, the main circuit amplifier and the auxiliary circuit amplifier are connected in parallel, the main circuit amplifier and the auxiliary circuit amplifier are DreaMOS transistors, and the main stray capacitor and the auxiliary stray capacitor are respectively a stray capacitor in the main DreaMOS transistor and a stray capacitor in the auxiliary DreaMOS transistor. According to the Doherty radio frequency power amplifier, the DreaMOS technology is adopted, the function of an output matching circuit in the Doherty radio frequency power amplifier is simply and efficiently achieved, and meanwhile ultra wide band, high efficiency and miniaturization are achieved.

Description

technical field [0001] The invention belongs to the technical field of power amplifiers, and in particular relates to a Doherty radio frequency power amplifier module based on a novel DreaMOS process and an output matching network thereof. Background technique [0002] In recent years, integrated Doherty amplifiers have been used to realize amplifiers with moderate output power, such as 10-50W, at frequencies of 2-3GHz. However, in future applications such as micro-stations, pico-stations, and femto-stations in MIMO systems, a higher efficiency and wider bandwidth are required at higher frequencies such as 3.5GHz, such as covering the 3.3-4.2GHz frequency band, The efficiency is required to be more than 40%. Then it will be very difficult to apply the traditional integrated doherty scheme or discrete scheme. [0003] In existing discrete Dohtery amplifiers, impedance matching networks are usually included in the output section, such as figure 1 As shown, the impedance mat...

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Problems solved by technology

[0004] The above scheme has two disadvantages: 1. Impedance matching networks such as Zc and Zp are usually difficult to make broadband matching networks due to the limitation of area, so usually the Doherty bandwidth of this structure is only about 5%. The design often needs to use a large area, which is very unfavorable for the integrated power amplifier chip or module

2. In the existing scheme, the output matching circuit uses four parts, including Zc, Zp, Zinv, and Zcom. In many cases, a relatively long transmission line is used, resulting in high loss and low efficiency.

There are two disadvantages in this scheme: 1. It is related to the quality factor Q of the integrated Doherty combiner, which at least partially determines the power-added efficiency of the Doherty amplifier

This circuit forms a simple LC resonant circuit, which has a certain impact on the overall bandwidth of Dohety performance. The simulation predicts that the bandwidth will be reduced by about 20%, which is very unfavorable for designing a wide amplifier.

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