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Method, communication unit and integrated circuit for calibrating envelope tracking system

A technology of envelope tracking and wireless communication unit, which is applied in the field of correction envelope tracking system, can solve the problems of limited efficiency improvement, achieve the effects of improving efficiency, increasing operating range, and alleviating output power requirements

Inactive Publication Date: 2018-03-09
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventors have determined that lower equal-gain targets provide good power amplifier efficiency, but due to the limited maximum output power capability of RF transceivers, efficiency improvements are also limited

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  • Method, communication unit and integrated circuit for calibrating envelope tracking system
  • Method, communication unit and integrated circuit for calibrating envelope tracking system
  • Method, communication unit and integrated circuit for calibrating envelope tracking system

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Embodiment Construction

[0037] The main focus and application of the present invention is the field of radio frequency power amplifiers that can be used in wireless communication applications. Examples of the invention will be described in terms of one or more integrated circuits used in a wireless communication unit, such as a third generation partnership project (3GPP TM ) in the term user equipment. However, those skilled in the art will appreciate that the inventive concepts described herein may be implemented with any type of integrated circuit, wireless communication unit or wireless / radio frequency transmitter that incorporates or forms part of an envelope tracking system.

[0038] Examples of the invention are described in terms of power amplifier gain mapping techniques, such as introducing AM / AM compensation into a look-up table set of values ​​in a digital predistortion envelope tracking architecture. In this way, for example in a digital predistorter, a digital predistortion gain compens...

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Abstract

A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter of a wireless communication unit is described. The method comprising, within at least one signal processing module of the wireless communication unit, applying a training signal comprising an envelope that varies with time to an input of the RF transmitter, receiving at least an indication of instantaneous output signal values for the power amplifier module in response to the training signal, calculating instantaneous gain values based at least partly on the received output power values, and adjusting a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a power amplifier module gain, for example that is monotonically increasing as a function of power amplifier output power.

Description

【Technical field】 [0001] The present invention relates to methods of calibrating envelope tracking systems and related apparatus, and more particularly to envelope tracking systems for calibrating radio frequency (RF) transmitters of wireless communication units using power-aware power amplifier gain mapping method and device. 【Background technique】 [0002] For wireless communication systems, the constant pressure on the limited spectrum available is driving the development of spectrally-efficient linear modulation schemes. Due to the envelope fluctuations of many of these linear modulation schemes, the average power delivered to the antenna is much lower than the maximum available power, resulting in inefficient use of the power amplifier. In particular, there has been considerable research effort in this field to develop efficient topologies capable of providing high performance in the "back-off" (linear) region of power amplifiers. [0003] Linear modulation schemes re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20H03F1/32
CPCH03F1/0216H03F1/0222H03F1/3247H03F3/19H03F3/245H03F2200/102H03F2201/3233H03G3/004H03G3/3042
Inventor 颜升宏梁正柏
Owner MEDIATEK INC