High efficiency variable voltage supply

a variable voltage and high efficiency technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of high final stage efficiency, poor efficiency, implementation of such dynamic supply adjustment techniques, etc., and achieve the effect of minimising the peak amplitude of error level and minimising the slew rate of error level

Inactive Publication Date: 2007-09-13
SNAPTRACK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0049] The method may further comprise minimising the peak amplitude of the error level. The method may further comprise maintaining a ratio of peak error level to peak output level of less than 1. The ratio of the peak error level to peak output l

Problems solved by technology

This generally results in poor efficiency.
This results in high final stage efficiencies.
At least three problems exist in implementing such dynamic supply adjustment techniques.
Secondly, any noise or distortion in the supply to the amplifier will be modulated up to the carrier frequency resulting in unacceptable out-of-band spectral emissions.
When applied to high power

Method used

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Embodiment Construction

[0070] The invention is described herein by way of particular examples and specifically with reference to a preferred embodiment or embodiments. It will be understood by one skilled in the art that the invention is not limited to the details of the specific embodiments given herein. In particular the invention is described herein by way of reference to a supply architecture for supplying a radio frequency (RF) amplification stage. However more generally the invention may apply to any arrangement where it is necessary to provide a variable voltage level tracking a reference level.

[0071] Reference is first made to FIG. 1, which illustrates the concept of an envelope tracking supply voltage, and the problems associated therewith. The problem is described in relation to a variable voltage supply for a radio frequency (RF) amplifier, the voltage supply being varied to track the RF input signal to be amplified. By way of example, it is assumed that the variable voltage supply is provided...

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Abstract

There is disclosed a power supply stage (202), comprising: generating means for generating a power supply voltage from a high efficiency variable voltage supply (204) in dependence on a reference signal; adjusting means for receiving the generated power supply voltage (220), and adapted to provide an adjusted selected power supply voltage tracking the reference signal (216) in dependence thereon.

Description

FIELD OF THE INVENTION [0001] The present invention relates to control of a supply voltage level, in an arrangement in which the supply voltage is variable to track a reference level, which reference level may represent a signal to be amplified. BACKGROUND TO THE INVENTION [0002] Modern communications systems often employ linear modulation schemes that exhibit high peak to average power ratios to achieve high capacity. Signals subjected to such modulation have a wide dynamic range, infrequently achieve peak levels, and frequently operate below peak levels. To provide linear amplification for signals subjected to such modulation, traditional radio frequency (RF) amplifier architectures need to be significantly backed-off. This generally results in poor efficiency. [0003] A number of techniques exist to improve efficiency based on supply voltage. Notable amongst these supply voltage based efficiency enhancement schemes are those of envelope tracking and envelope elimination and restor...

Claims

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Application Information

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IPC IPC(8): H03F3/38H03F1/02
CPCH03F1/0211H02M5/02H03F2200/504G05F5/00H03F1/0233H03F3/19H03F2200/102H03F2200/204H03F2200/451
Inventor WILSON, MARTIN PAULFLINT, SHANE
Owner SNAPTRACK
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