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Printed Electronics World
Posted on April 23, 2009 by  & 

IMEC demonstrate 128 bit organic RFID transponder

At the ISSCC2009 conference in SAN FRANCISCO, Holst Centre - founded by the Belgian nanoelectronics research center IMEC and the Dutch research center TNO - presented a 128 bit organic RFID transponder chip with Manchester encoding and anti-collision protocol.
The organic "chip" had a data rate of 2kb/s, Manchester encoded data, and implemented the ALOHA anti-collision protocol to enable readout of multiple organic RFID tags, a ROM memory capacity of 128 bit and additional WORM (write-once read-many-times) memory.
The organic 128bit transponder chip is fabricated on a 25µm thin plastic substrate using organic bottom-gate thin-film transistors. The design of the chip was limited to p-type only logic. The chip requires a supply voltage of 20V to 24V which can be generated on a tag equipped with a plastic double half-wave rectifier and an antenna of 6 to 7 windings.
The transponder chip contains a 33-stage ring oscillator which generates the clock signal. The clock signal drives the output register, the 3 bit binary counter and the 16 bit line-select. The 16 bit line-select chooses a row in the code. A bit in this row is selected by the 8:1 multiplexer, driven by the 3 bit binary counter. This bit is transported to the output register, which sends the bit to the Manchester encoder. The latter encodes the data and sends it to the load modulator of the plastic RFID tag. To enable the readout of multiple organic RFID tags at once, the ALOHA basic anti-collision protocol (tag-talks-first protocol) is added to the chip.
The work was done within the framework of the Holst Centre research program on organic circuitry, in close collaboration between IMEC Leuven and TNO Eindhoven.
IDTechEx believes that the leading RFID silicon chip manufacturers will make RFID chips to the world's favorite RFID specification ISO14443 (in money spent) for about one cent in very high volume. In our opinion.
both organic and inorganic printed transistor circuits will become alternatives at much lower cost - probably one tenth of one cent in high volume.
Top image: Holst Centre's 128 bit RFID transponder foil.
For more information see External Link.

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Posted on: April 23, 2009

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