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Envelope tracking power amplifier structure having automatic alignment function

A technology of power amplifier and envelope tracking, which is applied in the direction of automatic power control and electrical components, etc., can solve the problems of lowering system reliability, greatly affecting the performance of envelope tracking power amplifiers, and complex systems, so as to reduce complexity, High output linearity, high efficiency effect

Active Publication Date: 2015-08-12
SOI MICRO CO LTD
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  • Abstract
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Problems solved by technology

Since ET technology uses feedforward, the delay of the feedforward path has a great influence on the performance of ETPA
In order to correct this delay, the envelope tracking power amplifier needs the support of the baseband algorithm, so the system is very complicated and greatly reduces the reliability of the system

Method used

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  • Envelope tracking power amplifier structure having automatic alignment function
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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0023] Such as figure 2 as shown, figure 2 It is a block diagram of an automatically aligned envelope tracking power amplifier structure provided by the present invention, and the envelope tracking power amplifier structure is to increase sequentially connected input signal envelope detectors (Envelope Detector) on the basis of existing envelope tracking power amplifiers , an envelope generation module (Envelope Generator) and an automatic delay alignment module (Timing Aligner), so that the envelope tracking power amplifier structure forms a feedforward path; wherein, the automatic delay alignment module includes a phase locked loop circuit (Phase Lock Loop ) and a variable bandwidth filter (Variable HPF), used to cor...

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Abstract

The invention discloses an envelope tracking power amplifier structure having an automatic alignment function. The envelope tracking power amplifier structure is formed in a manner that an input signal envelope detector, an envelope generation module and an automatic time-delay alignment module which are connected sequentially are added to an envelope tracking power amplifier, so that the envelope tracking power amplifier structure forms a feed-forward path. The automatic time-delay alignment module comprises a phase-locked loop circuit and a variable bandwidth filter, and is used for correcting the time-delay of the feed-forward path. According to the invention, the envelope tracking power amplifier can be achieved in a single chip and without base band supports, so that the complexity of a radio frequency emission link is greatly reduced, and the reliability is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, such as radio frequency transmitters in 3G, 4G communication and wireless local area networks, especially an automatically aligned envelope tracking power amplifier structure, which is an important circuit module in radio frequency transmitters. Background technique [0002] High-speed wireless communication technologies such as 3G, 4G mobile communication, and wireless local area network all use peak-to-average ratio modulation signals, which requires power amplifiers to retreat a large amount of power to meet the linearity requirements of the above-mentioned signals. The power backoff causes the power amplifier to work at a lower output power most of the time, so the efficiency is very low. [0003] In order to solve this problem, the academic community has proposed several schemes based on polar coordinate transmitters, including envelope tracking schemes, envelope elimination a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/081H03L7/093
Inventor 李志强萧延彬刘昱张海英
Owner SOI MICRO CO LTD
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