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

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Presentation on theme: "Investigation of the potential of organic circuits for RFID tags Qintao Zhang and Sha Li."— Presentation transcript:

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 Cgd0Cgs0

4 Good and Bad 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 Good things: Bad things:

5 AIM-spice Model Good enough Mobility 3cm 2 /V S Supply voltage 40V Channel Length 2µm2µm Contact resistance 7E5 ohm Channel width 50µm

6 Inverter Complementary Static inverter Organic Inverter CMOS Inverter

7 Inverter Pseudo-PMOS Depletion Load PMOS

8 Ring Oscillator Using Complementary inverter Wp/Wn=1/1, Vdd=40V, Freq=394.42KHz,P=490uW 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 Pseudo-PMOS COMPLEMENTARY (15/1) PSEUDODEPLETION Tp (us)14.136/2.53510.874.4 Frequency (KHz)70.741/394.4292.59313.44 Power (uW)81.027/490.37833.5912.456 Depletion Load PMOS

10 NAND and NOR Complementary NAND Complementary NOR

11 NAND and NOR COMPLEMENTARY NAND COMPLEMENTARY NORRATIO NAND DCVSL Thl (us)2.63/0.3150.575/0.2170.0560.73 Tlh(us)2.01/0.08991.61/0.1910.0250.026 Frequency (KHz)380/3174.6621.2/4608178571370 Power (uW)195/1.8355.5/9.2233220.7 DCVSL

12 Memory Mainly use P-type transistor in the ROM to improve the performance. OR ROM NOR ROM OR ROMNOR ROM Tp (ns)58.2231 Frequency (MHz)17.184.33 Power (uW)250256

13 Decoder OR ROMDECODERDECODER+ROM Tp (us)0.05822.032.33 Frequency (KHz)0.017492.6429.2 Power (uW)25031.8407 Decoder + OR ROM Decoder W=min Decoder Wp/Wn=2/15

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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