Linear efficient multi-body power amplifier based on harmonic impedance matching

Abstract

The invention relates to a linear efficient multi-body power amplifier based on harmonic impedance matching, which is characterized in that on the basis of a traditional Doherty power amplifier structure, a simple circuit structure is utilized to match an input / output fundamental wave resistor and a harmonic wave resistor of a sub-power amplifier of the power amplifier, so that the efficiency of the sub-power amplifier is improved; the saturation output power and the saturation output current of a peak power amplifier are improved by matching the input / output fundamental wave impedance, the second harmonic impedance and the third harmonic impedance of the peak power amplifier for the first time, so that the Doherty power amplifier has better load modulation; and finally, a carrier power amplifier is biased in the class AB, so that the linearity of the Doherty power amplifier in a low-power region is ensured, meanwhile, a proper peak power amplifier gate bias voltage is selected, and the linearity of the Doherty power amplifier in a high-power region is finally ensured by utilizing the mutual influence effect of the carrier power amplifier and the peak power amplifier.

Description

technical field [0001] The invention belongs to the field of radio frequency power amplifiers, in particular to a linear high-efficiency symmetrical Doherty power amplifier suitable for 5G communication systems. Background technique [0002] In recent years, the rapid development of wireless communication technology has greatly promoted the deployment of modulated signals such as Long Term Evolution (Long Term Evolution, LTE) and Worldwide Interoperability for Microwave Access (WiMax), which on the one hand have a large capacity of information Transmission capability, on the other hand, has a high peak-to-average power ratio (Peak to Average Power Ratio, PAPR), which can reach 6-12dB. However, when the output power of a traditional Class A or Class AB power amplifier reaches saturation, the drain efficiency also reaches the maximum value. When the power drops back by 6dB or more, the drain efficiency of the power amplifier is greatly reduced, and most of it is converted into...

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Problems solved by technology

But class F / F -1 The class power amplifier design is complicated, and the linearity is not high, which seriously affects the linearity of the Doherty power amplifier in the low-power region; in addition, the peak power amplifier in the Doherty power amplifier structure is biased in the class C, and its inherent disadvantages are low saturated output current and small gain, so large Most high-efficiency Doherty amplifiers have poor load modulation, which ultimately leads to suboptimal performance of the Doherty amplifier

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