Multi-channel power combining circuit applied to out-of-phase power amplification system

Abstract

The invention relates to a multi-channel power combining circuit applied to an out-of-phase power amplification system. The multi-channel power combining circuit comprises multiple out-of-phase powercombining circuits which are serially connected between a plurality of switching power amplifiers and a load. Each out-of-phase power combining circuit comprises a phase adjustment module and an out-of-phase power combining module. The phase adjustment module adjusts the output load impedance of each branch power amplifier to a position symmetrical about the real axis on the Smith chart; the out-of-phase power combining module is used to make the load impedance of the branch power amplifier close to the pure resistor, which reduces the phase requirement of each load. The output terminals of four switching power amplifiers are connected with one out-of-phase power combining circuit. The invention improves the structure of the Chireix power combiner so that the real part of the load impedance is close to the resistor load, reduces the phase requirement of the output impedance of the branch power amplifier, and improves the linearity, output power and efficiency of the whole circuit.

Description

technical field [0001] The invention belongs to the technical field of radio frequency communication, and relates to a multi-channel power synthesis circuit applied to a different-phase power amplification system. Background technique [0002] With the rapid development of wireless communication technology, radio frequency microwave technology is becoming more and more important in people's daily life. In order to save more energy in the promotion of energy conservation and environmental protection today, communication companies usually use power amplification systems with high linearity, high efficiency and high output power, and use traditional out-of-phase power amplification systems to amplify constant envelope signals. Its advantage is that it has high output power and efficiency, and has high linearity for the output modulation signal. However, the Chireix power combination used in the traditional out-of-phase power amplification system has very high conditions of use...

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Problems solved by technology

However, the applicant found in the research that in fact, the traditional Chireix power combiner has too strict requirements on the phase of the output impedance of the branch power amplifier, otherwise it will have a great impact on the linearity, output power and efficiency of the entire out-of-phase power amplification system. However, the realization conditions of the traditional Chireix power synthesizer are too ideal, and the realization is too complicated in reality

However, with the rapid development of communication technology, the requirements for radio frequency communication systems are also getting higher and higher. The realization conditions for the traditional Chireix power combiner are too strict and cannot meet the requirements of today's wireless communication systems. Therefore, it is urgent to develop Developed a multi-channel power combining circuit applied to out-of-phase power amplification system to improve system linearity, output power and efficiency to meet the high transmission data rate requirements of current and future wireless communication systems

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