Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier

Abstract

The invention discloses a method for improving efficiency of a wide-band radio frequency power amplifier, namely adding a harmonic source suppression network in output of the wide-band radio frequency power amplifier for improving efficiency. The invention also discloses a circuit structure for improving the efficiency of the wide-band radio frequency power amplifier. The circuit structure disclosed by the invention comprises a wide-band radio frequency power amplifier stage, a wide-band output matching network and a harmonic suppression network, wherein the wide-band output matching network is used for effectively outputting an output signal; the harmonic suppression network is used for carrying out harmonic suppression on a signal input into the wide-band output matching network, and the harmonic suppression network is formed by at least two second harmonic suppression networks which are connected between output of the wide-band radio frequency power amplifier stage and the ground in parallel. The method and the structure for improving the efficiency of the wide-band radio frequency power amplifier have the advantages that a second harmonic suppression circuit is adopted for being independent from an output matching network, a resonant frequency point can be flexibly controlled, second harmonic is effectively suppressed, efficiency and output capability of the power amplifier are improved, and wide-band matching is formed, so that the radio frequency power amplifier can operate in a wide range, and performances of the radio frequency power amplifier are improved.

Description

technical field [0001] The invention relates to the field of electronic technology, and relates to a method for improving circuit performance, in particular to a method and circuit structure for improving the efficiency of a broadband radio frequency power amplifier. Background technique [0002] With the development of wireless communication technology and the improvement of people's living standards, people's requirements for handheld mobile wireless communication are no longer satisfied with simple voice calls, and gradually develop from basic voice calls to multimedia services, so that the current mobile wireless communication The complexity of the system is increasing rapidly, and various mobile communication networks coexist, such as the widely used 2G, 3G and 4G mobile communication networks. In order to support these communication networks with different operating frequency bands, the demand for radio frequency power amplifiers etc. of mobile terminals begins to incr...

AI Technical Summary

Problems solved by technology

However, the farther the frequency point from the center frequency of the broadband RF power amplifier of this structure is, the lower the output power and efficiency can be achieved, and the overall efficiency is not high.

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