Output circuit structure of radio frequency powder amplifier

Abstract

The invention discloses an output circuit structure of a radio frequency powder amplifier. The output circuit structure of the radio frequency powder amplifier comprises a triode. The base electrode of the triode is the input end, the collector electrode is the output end, and the emitter electrode is connected to the ground. The output end is connected with a harmonic trap circuit formed by serially connecting a first capacitor and an inductor, and the terminal of the inductor is connected to the ground. The output circuit structure of the radio frequency powder amplifier further comprises an ESD protective string formed by serially connecting a plurality of diodes. The positive electrode terminal of the protective string and one end of the first capacitor adjacent to the collector electrode are positioned in the same electric potential, and a node or the negative electrode terminal is connected between the first capacitor and the inductor so as to partially or totally connect with the first capacitor in parallel. The break-over voltage of the ESD protective string is smaller than the breakdown voltage of the first capacitor. The overvoltage damage of the first capacitor is avoided while the ESD protection function is realized, and the reliability is improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency power amplifiers, in particular to an output circuit structure of a radio frequency power amplifier. Background technique [0002] RF power amplifier is an important part of wireless signal transmission. The power of the radio frequency signal generated by the modulation oscillator circuit is very small and attenuates quickly during transmission, so it needs to be amplified before being transmitted. The nonlinear characteristics of the RF power amplifier make the output include not only the fundamental signal, but also harmonics, and the magnitude of the harmonics is proportional to the magnitude of the fundamental signal. In the power amplifier, since the output fundamental wave power is relatively large, the harmonic power is also relatively large, causing non-negligible interference to the system. [0003] In order to eliminate harmonics, a widely used method is to configure an LC res...

AI Technical Summary

Problems solved by technology

In RF power amplifier applications, the harmonic capacitor voltage drop may be much higher than the collector terminal voltage. Under impedance mismatch conditions, the capacitor voltage drop may exceed the maximum allowable capacitor voltage, which will cause capacitor characteristic degradation or excessive Pressure damage, thus losing the ability to filter harmonics, especially when applied to mobile phone terminals, it is easy to cause catastrophic problems such as failure and damage

Images