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Method and arrangement in a mobile communication system

A signal and dynamic technology, which is applied to the components of the amplification device, the amplifier with the distributed constant of the coupling network, the amplifier with the semiconductor device/discharge tube, etc., to achieve the effects of small sensitivity, high efficiency, and reduced influence

Inactive Publication Date: 2012-06-13
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Consequently, the efficiency of the LM amplifier is also degraded by shunt losses, where the degradation is greater for lower output amplitudes than for higher output amplitudes

Method used

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  • Method and arrangement in a mobile communication system
  • Method and arrangement in a mobile communication system
  • Method and arrangement in a mobile communication system

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Embodiment Construction

[0033] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will convey knowledge to those skilled in the art. personnel to fully convey the scope of the invention. In the drawings, like reference symbols refer to like elements.

[0034] Furthermore, those skilled in the art will appreciate that control of the functions and devices described below can be implemented using software functions in conjunction with a programmed microprocessor or general purpose computer, and / or using application specific integrated circuits (ASICs). It should also be understood that while the present invention has been primarily described in terms o...

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Abstract

The present invention relates to an amplifier circuit where a load modulation is applied to a segmented amplifier. This will reduce the shunt loss since the loss of a segmented amplifier is reduced by allowing each amplifier segment or combination of segments to operate to their full output power capacity, rather than limited to a lower output power which results in a higher shunt loss. Hence, operation to full capacity before adding more segments is made possible by dynamically modulating the load.

Description

technical field [0001] The present invention relates to methods and devices in mobile communication systems, and in particular to solutions for increasing the efficiency of amplifiers in such systems. Background technique [0002] Transmitters in base stations and mobile phone terminals, as well as those used in broadcast and other wireless systems, require power amplifiers (PAs) to amplify radio frequency (RF) signals fed to antennas. Such PAs often need to be very efficient in order to increase battery time, reduce energy costs, and minimize cooling requirements. [0003] Traditional Class B and Class AB PAs typically operate at constant load and constant supply voltage. "Optimal load" (Ropt) is the load that gives the highest output power under the allowable operating conditions. Class B or AR operation means that the transistor current pulse has approximately a quarter wavelength rectified sinusoidal waveform. The current pulses have approximately the same shape at al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/21H03F3/60
CPCH03F3/211H03F3/24H03F2203/21145H03F2200/378H03F2203/21139H03F3/602H03F1/0277H03F2200/391H03F1/565
Inventor 里卡德·赫尔贝里
Owner TELEFON AB LM ERICSSON (PUBL)
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