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Exploring Organic Circuits for RFID Tags: Potentials and Limitations

Investigate the feasibility of organic circuits for RFID tags. Organic transistors offer unique advantages like flexibility, transparency, and bespoke designs. However, limitations in size and power consumption compared to traditional CMOS circuits impact working distance. Research explores various designs, including complementary inverters, ring oscillators, and DCVSL memory. Utilizing current organic transistor technology, it's feasible to operate RFID at 125KHz. The study emphasizes the potential improvements needed to enhance the efficiency of organic RFID applications.

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Exploring Organic Circuits for RFID Tags: Potentials and Limitations

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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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