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Envelope tracking power supply based on class-E DC (direct current)-DC converter

A DC converter and envelope tracking technology, applied in the field of envelope tracking, can solve the problems of bandwidth, output slew rate, compromise between bandwidth and efficiency, limited improvement of bandwidth, etc., and achieve high switching frequency and high conversion efficiency , the effect of wide bandwidth

Inactive Publication Date: 2013-01-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

However, the bandwidth and output slew rate of ordinary DC-DC converters are difficult to meet the requirements of practical applications.
Common methods to improve its bandwidth can be divided into two types: one is to realize multi-input or multi-level DC-DC converter through multiple Buck circuits, but the improvement of bandwidth is limited; the other is to use a wider bandwidth Linear Amplifier Assist for a Tradeoff Between Bandwidth and Efficiency
The compromise method improves bandwidth to some extent, but greatly reduces its efficiency

Method used

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  • Envelope tracking power supply based on class-E DC (direct current)-DC converter
  • Envelope tracking power supply based on class-E DC (direct current)-DC converter
  • Envelope tracking power supply based on class-E DC (direct current)-DC converter

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Embodiment approach

[0040] The basic implementation unit of the continuous frequency sweep circuit 201 is as figure 2 (a) As shown, it includes two parts: amplitude adjustment circuit, phase-locked loop or voltage-controlled oscillator. The amplitude adjustment circuit mainly amplifies or attenuates the input envelope signal to meet the input requirements of the voltage-controlled oscillator. By obtaining the inverse of the relationship between the final output voltage of the envelope tracking power supply and the frequency of the input signal of the Class E DC-DC converter 300 and the relationship between the control voltage of the voltage-controlled oscillator and the frequency of the output signal, the gain or attenuation of the amplitude adjustment circuit is designed, and the control The output frequency of the voltage-controlled oscillator makes the final class-E DC-DC converter 300 proportional to the output of the envelope detection circuit 100 .

[0041] The discrete frequency sweep ci...

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Abstract

The invention provides an envelope tracking power supply based on a class-E DC (direct current)-DC converter. The envelope tracking power supply comprises an envelope detection circuit, a frequency conversion control circuit and a class-E DC-DC converter, wherein the class-E DC-DC converter consists of a drive circuit, a class-E inverting circuit, a matching network and a resonant rectification circuit. According to the envelope tracking power supply, signal envelop is obtained through envelop detection, then the conversion from the envelop to frequency is carried out, and the output power of the class-E DC-DC converter is controlled through continuous frequency scanning or discrete frequency scanning, so that the tracking on the original signal envelop of output voltage is realized. Because the class-E DC-DC converter has high efficiency near the center frequency of the class-E DC-DC converter, works at a high frequency range, and has large slew rate, the envelope tracking power supply disclosed by the invention has the characteristics of high efficiency, high tracking precision and the like.

Description

technical field [0001] The invention relates to an envelope tracking technology in the design of a radio frequency power amplifier in wireless communication, in particular to an envelope tracking power supply based on an E-class DC-DC converter. Background technique [0002] With the advancement of wireless communication technology to 4G, users demand high data rates, and in order to improve spectrum utilization, modern communication technologies generally use complex modulation methods with variable envelopes. This results in a signal with a high peak-to-average power ratio. For peak-to-average ratio signals, in order to meet the linearity requirements, power amplifiers such as class AB or class B must work in the power back-off region, which will lead to a serious drop in the average efficiency of the power amplifier, that is, a compromise between linearity and efficiency of the power amplifier. [0003] In order to improve the efficiency of the power amplifier in the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/338
Inventor 游飞吕亚博代志江童仁彬丁炫谢树义何松柏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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