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Investigation of the potential of organic circuits for RFID tags

Investigation of the potential of organic circuits for RFID tags. Qintao Zhang and Sha Li. Matthias Handy. RFID-Workshop, 30.9./1.10.04, Berlin. Organic transistors. Organic tags are the only way of under-1-cent RFID tags. Cgd0. Cgs0. Good and Bad things. Good things:.

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Investigation of the potential of organic circuits for RFID tags

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  1. Investigation of the potential of organic circuits for RFID tags Qintao Zhang and Sha Li

  2. Matthias Handy RFID-Workshop, 30.9./1.10.04, Berlin

  3. Organic transistors • Organic tags are the only way of under-1-cent RFID tags Cgd0 Cgs0

  4. Good and Bad things Good things: • No standard structures, L=5mm~10nm, W=several 100um~10mm, large overlap capacitance • No standard semiconductor materials, Pentacene, P3HT, CuPc • No Standard gate dielectric, K=2 to 16 • No control of parameters, lots of different Vt reported • fabrication limitation: Can’t shrink devices, typical number L=2µm, W=50µm for inkjet printing • Flexible fabrication: soluble materials can be printed on all kinds of material • Transparent, important for display, may get e-paper, e-poster Bad things:

  5. AIM-spice Model • Good enough

  6. Inverter • Complementary Static inverter CMOS Inverter Organic Inverter

  7. Inverter Pseudo-PMOS Depletion Load PMOS

  8. Ring Oscillator Wp/Wn=1/1, Vdd=40V, Freq=394.42KHz,P=490uW • Using Complementary inverter Wp/Wn=1/15, Vdd=40V, Freq=70.741KHz, P=81uW Wp/Wn=1/1, Vdd=14.3V, Freq=125.36KHz, P=15.7uW

  9. Ring Oscillator Depletion Load PMOS Pseudo-PMOS

  10. NAND and NOR Complementary NAND Complementary NOR

  11. NAND and NOR DCVSL

  12. Memory NOR ROM • Mainly use P-type transistor in the ROM to improve the performance. OR ROM

  13. Decoder Decoder W=min Decoder Wp/Wn=2/15 Decoder + OR ROM

  14. Conclusion • Using current organic transistor technology, it is possible to run the RFID at 125KHz. • Due to the big size of the device, the power consumption is much bigger than the regular CMOS circuit. This severely reduces the working distance of the organic RFID.

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