Radio frequency power amplifier module

Abstract

The invention discloses a radio frequency power amplifier module which comprises a power amplifier, a radio frequency switch and a controller. Wherein the radio frequency switch further comprises a radio frequency core. The radio frequency core is used for switching between amplification channels of different frequency bands and switching between a transmitting channel and a receiving channel. Theradio frequency core also uses the second negative voltage to perform negative voltage bias on the disconnected channel. The controller further comprises a charge pump and a buffer stage circuit. Thecharge pump is used for generating a first negative voltage. The buffer stage circuit is used for raising the first negative voltage to a second negative voltage. According to the invention, the charge pump is changed to be integrated into the controller. The radio frequency switch and the controller are usually manufactured on different substrate materials by adopting different processes, so that adverse effects of clock signals of the charge pump on the performance of the radio frequency switch are avoided. In addition, a buffer stage circuit is additionally arranged behind the charge pump,and a certain power supply rejection ratio is provided for restraining ripples on negative voltage output by the charge pump.

Description

technical field [0001] This application relates to a radio frequency power amplifier module including a power amplifier, a radio frequency switch and a controller. Background technique [0002] In a mobile terminal, a radio frequency power amplifier (RF power amplifier, RF PA for short) is used to amplify the power of a radio frequency signal to be transmitted, and then feed it to an antenna for external transmission. With the development of mobile communication technology, a mobile terminal needs to be compatible with more and more communication systems and frequency bands. In order to reduce the cost and size of the mobile terminal, the RF power amplifier is designed to cover as many frequency bands as possible, which introduces an RF switch (RF Switch) and a controller (controller). [0003] see figure 1 , which is an existing radio frequency power amplifier module (PA Module). The radio frequency power amplifier module includes a power amplifier 10 , a radio frequency...

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is: if the clock signal frequency of the charge pump 22 is reduced, in order to make the negative voltage output by the charge pump 22 reach the same driving capability, it is necessary to increase the capacitance used by the charge pump 22, which will increase the frequency of the RF switch. 20 area

The disadvantage of this solution is: if the distance between the charge pump 22 and the radio frequency core 21 is increased, the area of ​​the radio frequency switch 20 will also be increased

The disadvantage of this solution is: if the clock signal frequency of the charge pump 22 is increased, the interference of the clock signal of the charge pump 22 on the radio frequency switch 20 will increase

The disadvantage of this solution is: if the capacitance used by the charge pump 22 is increased, the area of ​​the RF switch 20 will be increased

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