Radio-frequency power amplifier and a front-end transmitter

Abstract

The invention relates to the technical field of communications, in particular relates to a radio-frequency power amplifier which comprises a linearity compensation circuit and an amplifier, wherein the linearity compensation circuit and the amplifier are connected in parallel; the linearity compensation circuit comprises a primary radio-frequency amplifier transistor and a bias circuit enabling the amplifier transistor to generate gain compression; and the radio-frequency power amplifier is biased at a class AB state. According to the invention, the circuit generating linearized compensation enables the bias current of the primary radio-frequency amplifier transistor to increase along with the increment of input power through the adaptive adjustment of the bias circuit; the gain of the radio-frequency amplifier transistor is increased in the case of relatively higher power input so as to generate gain expansion; and by connecting the primary radio-frequency amplifier transistor with the other level of amplifier in parallel, the generated gain expansion can be used for compensating the gain compression of the level of amplifier so as to improve the linearity of the power amplifier.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a radio frequency power amplifier and a front-end transmitter. Background technique [0002] With the evolution of modern wireless communication towards high-speed and large-capacity, users' requirements for broadband communication continue to increase, and the next-generation technology is becoming more and more demanding on the performance of radio frequency and microwave power amplifiers. Regardless of 3G's long-term evolution project (LTE, LongTerm Evolution), or IMT-Advanced technology compatible with TD-LTE, RF power amplifiers have similar technical characteristics, requiring lower signal distortion and higher signal peak-to-average power ratio. . In order to transmit a signal with a higher peak-to-average power ratio without distortion, the power amplifier must not only meet the transmission requirements under the average power output, but also must ensure a linear...

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Problems solved by technology

[0003] But at the same time, a problem that has to be faced is that the RF power amplifier is essentially a nonlinear device, which will produce unwanted intermodulation distortion products, which will directly affect the quality of the RF signal

The distortion introduced by the RF amplifier will cause the amplified signal to be distorted in amplitude and phase. The greater the input power, the more obvious its nonlinear characteristics, and when the modulated signal with a certain bandwidth passes through the power amplifier, an intermodulation component will be generated. , causing spectrum expansion, causing interference to adjacent channel signals, directly affecting the bit error rate of the receiving system, and deteriorating the performance of the communication system

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