A high-bandwidth envelope tracking power supply and its control method

Abstract

The invention discloses a high-broadband envelope line tracking power supply and a control method therefor. The power supply comprises a step wave voltage generation circuit, a control circuit and an A type linear amplifier, wherein the step wave voltage generation circuit consists of n series units connected in series; each series unit consists of m voltage generation circuit units connected in series; according to the method, n groups of m fitted pulse signals within a changing period are selected based on timing sequence; the rising edges of the m fitted pulse signals in any one group are allocated to one group of control signals independently, namely the rising edges are used as the rising edges of the group of control signals; the falling edges of the m fitted pulse signals in any one group are allocated to one group of control signals independently, namely the falling edges are used as the falling edges of the group of control signals; and the switch-on and switch-off time of a switching tube can be effectively expanded in a high-broadband envelope line tracking condition to ensure full switch-on and full switch-off, so as to improve the switching performance and the working reliability of the switching tube in the high-frequency operation and to realize actual high-broadband envelope line tracking.

Description

technical field [0001] The invention relates to a high-bandwidth envelope tracking power supply and a control method thereof, which are applied to wireless communication base stations or mobile phone power supply systems, and belong to the category of communication and power conversion. Background technique [0002] The power amplifier (Power Amplifier, PA) plays an important role in the mobile phone base station, and its power consumption can reach 50% of the power of the base station. Traditional mobile communication uses digital modulation methods such as frequency shift keying and phase shift keying. The envelope amplitude of the RF (Radio Frequency, RF) input signal of the PA is constant, and a nonlinear PA powered by a constant voltage is used. The signal can be amplified efficiently. However, with the rapid growth of the number of mobile communication users and the further improvement of people's requirements for data transmission rates, modern mobile communication t...

AI Technical Summary

Problems solved by technology

When the switching converter directly tracks the reference signal with varying amplitude, the switching frequency often needs to reach more than 10 times the frequency of the reference signal, that is, the ratio of the switching frequency to the tracking signal frequency reaches the order of 10:1, which makes the switching frequency too high. It is difficult to realize in the actual circuit, which seriously limits the improvement of the tracking bandwidth of the envelope tracking power supply

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