Power amplifier based on comb filtering

Abstract

The invention discloses a power amplifier based on comb filtering. The power amplifier comprises an input port, an input matching circuit, a biasing circuit, a transistor, an output matching circuit,a harmonic suppression circuit and an output port which are sequentially connected; a signal to be amplified is connected to the input port and is transmitted to the input matching circuit, and the signal is amplified through the biasing circuit and the transistor; and the amplified signal is filtered by the output matching circuit and the harmonic suppression circuit, and the filtered signal is transmitted to a signal receiving device through the output port. According to the invention, higher harmonics of the power amplifier are mainly suppressed; harmonic energy generated by the power amplifier is recovered through combination of the comb-shaped harmonic suppression circuit and the output matching network. The power amplifier is simple in structure, suppresses harmonic components at a load, guarantees the efficiency of the power amplifier, enables the power amplifier to be easy to realize, achieves the purpose of high efficiency, facilitates miniaturization and integration of a communication system, and has very good practical value.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a power amplifier based on comb filtering. Background technique [0002] With the rapid development and wide popularization of wireless communication, wireless system standards have higher and higher performance requirements for transceivers. The power amplifier is the main component of the transmitter, and its indicators determine the performance of the transmitter. For example, the efficiency determines the power consumption of the whole machine, the linearity determines the dynamic range of the whole machine, and the size of the harmonic component is the measure of the linearity of the transmitter. . In order to obtain higher efficiency in traditional power amplifiers, the power amplifier tube usually works in a saturated state, and a large number of harmonic components will be generated at this time. If the harmonic components are not recovered and suppressed, it will...

AI Technical Summary

Problems solved by technology

If the harmonic components are not recovered and suppressed, it will not only cause waste of energy, reduce its efficiency, but also cause interference to signals of other channels

[0003] Usually, the power amplifier works in class F in order to obtain higher efficiency and lower harmonic components, but this structure requires the use of λ / 4 transmission lines, which occupy a large space, which is not conducive to miniaturization and has poor harmonic suppression effect. obvious

A low-pass output matching network is used to design a power amplifier working in class E, which requires the power amplifier tube to have a high collector breakdown voltage, which is contrary to the development trend of integrated circuits and the harmonic suppression effect is not good.

The power amplifier designed by GaN technology, in order to obtain better harmonic performance, the design introduces two open transmission lines in the output matching network, but the use of open transmission lines makes this method compatible with modern circuits to the direction of miniaturization and high integration Development contradicts

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