Radio-frequency power amplifier and a front-end transmitter

A technology of radio frequency amplifier and power amplifier, which is applied in the field of communication, can solve problems such as adjacent channel signal interference, deterioration of communication system performance, and influence of radio frequency signal quality, and achieve the effect of improving linearity
CN102111112AActive Publication Date: 2011-06-29北京中科微投资管理有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
北京中科微投资管理有限责任公司
Publication Date
2011-06-29

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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.
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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...

Claims

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