A multimode multi-frequency radio frequency power amplifier

Abstract

The invention discloses a multimode multi-frequency radio frequency power amplifier. The multimode multi-frequency radio frequency power amplifier comprises an amplifier bare chip, an output matchingnetwork, a radio frequency switch bare chip and a CMOS controller. The amplifier bare chip is provided with only one amplification path, and amplification of signals of all frequency bands is achievedat the same time. The output matching network is arranged between the amplifier bare chip and the radio frequency switch bare chip and is used for carrying out impedance matching on each frequency band signal. The radio frequency switch bare chip comprises three paths, and a signal output by the output matching network is connected to one path and then is accessed to the antenna. The first path is a direct connection path of an LTE frequency band signal, the second path is a matching network for suppressing second harmonics of a GSM high frequency band signal, and the third path is a matchingnetwork for suppressing second harmonics of a GSM low frequency band signal. The CMOS controller determines which path the radio frequency switch bare chip uses according to the input signal type ofthe whole radio frequency power amplifier. The integration level of the chip is improved, and the area of the chip, the number of peripheral devices and the area of the occupied substrate are reduced.

Description

technical field [0001] The present application relates to a radio frequency power amplifier in a mobile terminal. Background technique [0002] Existing mobile communication technologies include 2G, which is mainly used for voice communication, and 3G and 4G, which are mainly used for data communication. There are three generations of mobile communication standards in total, and the next generation of mobile communication standards may also be included in the future. The 2G standard is typically represented by the GSM network standard, and the working frequency band of the GSM network is divided into low frequency band (LB) and high frequency band (HB). The GSM low frequency band includes the GSM850 frequency band with a frequency range of 824MHz to 894MHz, and the GSM900 frequency band with a frequency range of 880MHz to 960MHz. The GSM high frequency band includes the DCS1800 frequency band with a frequency range of 1710MHz to 1880MHz, and the PCS1900 frequency band with ...

AI Technical Summary

Problems solved by technology

Third, the power of the GSM low frequency band is twice the power of the GSM high frequency band. For example, sharing a bare chip amplification channel, how to improve the efficiency of the GSM high frequency band under the premise of meeting the performance of the GSM low frequency band is also a difficult problem

Fifth, the frequency span from the GSM low frequency band to the Band41 frequency band of the TDD-LTE network standard is very large, and it is difficult to design such a wide bandwidth with a matching circuit

The scheme is a single-input-multiple-output structure as a whole, and the degree of integration still needs to be improved; the shared first segment cannot be adjusted, which reduces the adjustability

In addition, the efficiency, harmonic suppression capability, linearity, and bandwidth range of the RF power amplifier are all important performance indicators, and this scheme does not involve

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