Amplifier modulation

An amplifier and resistor technology, applied in the field of amplifier modulation, can solve the problems of limited communication range, amplifier heat dissipation requirements and unsuitable power consumption, etc., to achieve the effect of reducing heat dissipation requirements, increasing data transfer rate, and stable current level

Inactive Publication Date: 2007-11-28
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, conventional readers consume more than 9 watts of power to produce one watt of output, resulting in only about 10% power efficiency
The thermal requirements and power consumption of this amplifier are unsuitable for many applications, including those requiring low-cost handheld RF readers
Therefore, although a traditional handheld reader has a smaller power output such as 100 mW, it has limited communication range and similar power inefficiencies

Method used

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  • Amplifier modulation
  • Amplifier modulation
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Examples

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Embodiment Construction

[0024] FIG. 1 is a block diagram illustrating an example radio frequency identification (RFID) system 2 . RFID system 2 includes an RFID station (“station”) 4 that interacts with tags 14 via radio frequency signals 16 . Specifically, station 4 includes an RFID reader ("reader") 12 that generates and receives RF communications 16 via antenna 15 to power and receive information from tags 14 . The reader 12 and tag 14 communicate using amplitude modulated RF communication 16 according to defined protocols such as ISO / IEC 14443 and ISO / IEC 15693 standards.

[0025] Station 4 provides a workstation or other computing environment to process information received from tags 14 and provide tag programming information to readers 12 . Station 4 includes, for example, processor 8 in communication with reader 12 via communication link 13 . As shown, the reader 12 can be built-in, external to the station 4, or even be a hand-held portable reader. Thus, link 13 may be an RS-232 serial comm...

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Abstract

In general, the invention is directed to an efficient amplifier for use in radio-frequency identification (RFID) applications. In particular, the invention provides a highly efficient amplifier that requires little power, yet has significant modulation bandwidth to achieve high data communication rates. The amplifier makes use of many components of a class E amplifier including a first transistor, an inductor coupling the first transistor to a power supply, and a shunt capacitor connected in parallel to the first transistor. A second transistor is connected in parallel to the first transistor. A controller selectively controls the first and second transistors to achieve amplitude modulation at a high modulation bandwidth.

Description

technical field [0001] The present invention relates to radio frequency systems, and more particularly, the present invention relates to amplifier modulation in radio frequency systems. Background technique [0002] Radio frequency identification (RFID) technology has been widely used in nearly every industry, including transportation, manufacturing, waste management, mail tracking, airline baggage checking systems and highway toll management. One common application of RFID technology is in electronic article surveillance (EAS) systems to prevent shoplifting or unauthorized removal of merchandise. In particular, EAS systems can be used to detect the presence of EAS markers (tags) passing through an excitation field. Retail outlets, libraries, video stores, etc. use RFID technology combined with EAS systems to assist in asset management, organization and inventory tracking. [0003] A typical RFID system includes an RFID tag, an RFID reader, and a computing device. An RFID...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00G06K19/07H03F1/02H03F3/217H03F3/24H04L27/02
CPCG06K7/0008H03F3/2176G06K7/00
Inventor R·D·吉斯米
Owner 3M INNOVATIVE PROPERTIES CO
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