Device for Improving Linearity of Radio Frequency Power Amplifier
A radio frequency power and amplifier technology, applied in the field of radio frequency power amplifier linearization, can solve the problems of complex structure and difficult debugging, and achieve the effects of simplifying complexity, improving precision and improving linearity
Inactive Publication Date: 2016-05-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0005] Aiming at the shortcomings of the traditional feedforward system, which is complex in structure and difficult to debug, and comprehensively considering the problems existing in the traditional feedforward system, the present invention proposes a new type of feedforward system
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[0028] Embodiment: Method and device for improving linearity of radio frequency power amplifier
[0029] Such as figure 2 Diagram of the setup for improving the linearity of RF power amplifiers. The feedforward system is composed of the following parts: a radio frequency signal acquisition circuit, an analog predistorter, an error signal adjustment circuit, a main power amplifier, an error cancellation loop, and an adaptive control circuit. The radio frequency signal acquisition circuit collects the radio frequency input signal and the radio frequency output signal as the input signal of the adaptive control circuit. The analog predistorter, on the one hand, generates the error signal required by the error cancellation loop, which simplifies the complexity of the error signal generated by the traditional feedforward technology. On the other hand, it generates the predistortion signal, and first linearizes the main power amplifier. The error signal adjustment circuit adjusts...
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The invention discloses a device for improving the linearity of a radio frequency power amplifier, comprising: a main power amplifier, which amplifies the power of radio frequency signals; a radio frequency signal acquisition circuit, which collects radio frequency input and output signals of the main power amplifier, and adjusts the power of the radio frequency output signal; an analog predistorter, In the front of the main power amplifier, an error signal is generated, and the pre-distortion signal is output to initially linearize the main power amplifier; the error signal adjustment circuit adjusts the error signal output by the analog predistorter to ensure that the output error signal is equal to the amplitude of the main signal The phases are opposite; the analog predistorter, the main power amplifier, and the error signal adjustment circuit are connected end to end in order to form an error cancellation loop to offset the distortion component of the main road signal; the adaptive control circuit uses radio frequency input and output signals, and undergoes digital signal processing , to output a control signal to further optimize the linearization effect of the feedforward system. It simplifies the complexity of the structure of traditional feedforward technology, not only can obtain high linearity, but also improve the precision of system adjustment through adaptive control.
Description
technical field [0001] The invention relates to a radio frequency power amplifier linearization technology in wireless communication technology, in particular to a feedforward linearization technology of a radio frequency power amplifier, specifically a device for improving the linearity of a radio frequency power amplifier. Background technique [0002] With the development of wireless communication technology, more and more advanced communication standards have emerged, such as WCDMA, TD-SCDMA, WIMAX, LTE, etc., using multi-carrier technology with high spectrum utilization and complex digital modulation methods, such as 3G The downlink transmission of WCDMA standard of communication adopts QPSK modulation technology, and LTE adopts OFDM modulation technology. However, this method leads to a wide bandwidth and a high peak-to-average ratio of the baseband signal, which brings more serious challenges to the design of the power amplifier. In power amplifier design, efficiency...
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IPC IPC(8): H03F1/32
Inventor 何松柏王显飞侯宪允任芹黄超意马力江中坡游飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA