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Systems, methods, and apparatuses for linear envelope eliminating and recovering transmitters

A transmitter, linear technology, used in synchronization/start-stop systems, climate sustainability, energy-saving ICT, etc. Effect

Inactive Publication Date: 2007-12-19
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this feedback control structure, an accurate receiver must be included in the transmitter, and the control loop bandwidth should greatly exceed the signal bandwidth
Furthermore, the inherent gain-reducing nature of negative feedback can lead to severe constraints on amplifiers that do not have sufficient transmit gain
In addition, the traditional closed-loop system not only feeds back the distortion but also feeds back the signal power, which reduces the stability of the closed-loop system

Method used

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  • Systems, methods, and apparatuses for linear envelope eliminating and recovering transmitters
  • Systems, methods, and apparatuses for linear envelope eliminating and recovering transmitters
  • Systems, methods, and apparatuses for linear envelope eliminating and recovering transmitters

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Embodiment Construction

[0021] The present inventions now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Of course, these inventions may be embodied in many different forms and are not limited to the embodiments described herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like reference numerals refer to like elements throughout.

[0022] Embodiments of the present invention may provide a linear EER transmitter based on a polar modulation technique using two quadrature channels for amplitude and phase and an analog quadrature recursive predistortion linearization technique. Polar modulation techniques enhance battery life by dynamically adjusting bias levels. In addition, analog quadrature recursive predistortion provides sufficient instantaneous correction of amplitude and phase errors in RF PAs, thereby enhancing the PA's linear output power capab...

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Abstract

The invention provides systems, methods and apparatuses for linear envelope elimination and restoration transmitters, based on the polar modulation operation combined with the orthogon recursive predistortion. The polar modulation technique dynamicly regulates bias level to increase battery life. Moreover, the analogy orthogon recursive predistortion corrects amplitude and phase errors in a radiofrequency (RF) power amplifier (PA) effectively, enhances PA output capability. Even-order distortion components are used for predistortion of input signals by means of multiplication, improve effective correcting bandwidth. Moreover, the predistortion proposal of a temporary feedback envelope distortion signal allows to correct any distortion of correcting loop bandwidth including envelope memory effect.

Description

[0001] related application [0002] This application claims priority to US Provisional Application No. 60 / 803,871, filed June 4, 2006, and entitled "Systems, Methods, and Apparatuses for Linear Polar Transmitters," the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an envelope elimination and restoration (EER) transmitter, and more particularly, to a system, method, and apparatus for performance enhancement of a radio frequency (RF) power amplifier. Background technique [0004] In cost-sensitive mobile transmitters, the performance trade-off must be carefully managed to achieve high efficiency and high output power with the required gain and linearity. With the intrinsically nonlinear power amplifier (PA) itself, the only way to achieve better linear operation is to limit the dynamic range of the signal to a small fraction of the PA's total capability. Unfortunately, this limitation of dynamic range ...

Claims

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Application Information

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IPC IPC(8): H04L25/49
CPCY02B60/50
Inventor 禹王命李彰浩张在浚金学善
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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