The use of an alternating current (ac) source to power logic circuitry can support satisfactory device performance for a variety of applications, while enhancing long-term stability of the circuitry. For example, when organic thin film transistor (OTFT)-based logic circuitry is powered by an ac powe
The use of an alternating current (ac) source to power logic circuitry can support satisfactory device performance for a variety of applications, while enhancing long-term stability of the circuitry. For example, when organic thin film transistor (OTFT)-based logic circuitry is powered by an ac power source, the logic circuitry exhibits stable performance characteristics over an extended period of operation. Enhanced stability may permit the use of OTFT logic circuitry to form a variety of circuit devices, including inverters, oscillators, logic gates, registers and the like. Such circuit devices may find application in a variety of applications, including integrated circuits, printed circuit boards, flat panel displays, smart cards, cell phones, and RFID tags. In some applications, the ac-powered logic circuitry may eliminate the need for ac-dc rectification components, thereby reducing the manufacturing time, expense, cost, complexity, and size of the component carrying the circuitry.
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The invention claimed is: 1. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; and a radio frequency (RF) convener that converts RF energy to alternating current (ac) power, and directly powers the logic gate with the
The invention claimed is: 1. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; and a radio frequency (RF) convener that converts RF energy to alternating current (ac) power, and directly powers the logic gate with the ac power, wherein a waveform of the ac power has a period less than a propagation delay time of the logic gate. 2. The RFID tag of claim 1, wherein the logic gate includes one of an inverter, a NOR gate, and a NAND gate. 3. The RFID tag of claim 1, wherein the logic gate forms an analog amplifier. 4. The RFID tag of claim 1, further comprising a load capacitor coupled to an output of the logic gate. 5. The RFID tag of claim 4, wherein the logic gate is a first logic gate and the circuit further includes a second logic gate, wherein an output of the first logic gate drives an input of the second logic gate, and wherein the load capacitor is formed at least in part by an input capacitance of the second logic gate. 6. The RFID tag of claim 1, wherein the RFID tag includes a series of inverter stages, the inverter stages being coupled to form at least part of a ring oscillator. 7. The RFID tag of claim 6, further comprising: a plurality of data lines; and a plurality of logic gates that selectively output data from the data lines in response to a clock signal generated by the ring oscillator. 8. The RFID tag of claim 7, wherein the transistors include a plurality of thin film transistors arranged to form at least part of the logic gates. 9. The RFID tag of claim 1, wherein at least one of the transistors is an organic thin film transistor. 10. The RFID tag of claim 9, wherein at least one of the transistors is pentacene-based. 11. The RFID tag of claim 1, wherein at least one of the transistors is amorphous silicon-based. 12. The RFID tag of claim 1, wherein the logic gate comprises a CMOS logic gate. 13. The RFID tag of claim 1, wherein the transistors are formed on a flexible substrate. 14. The RFID tag of claim 1, wherein the first transistor is a load transistor and the second transistor is a drive transistor, and wherein a ratio of a gate width to a gate length of the load transistor is greater than or equal to a ratio of a gate width to a gate length of the drive transistor. 15. The RFID tag of claim 1, wherein the first transistor is a load transistor and the second transistor is a drive, transistor, and the load transistor and the drive transistor are arranged to form the logic gate. 16. The RFID tag of claim 15, wherein the ac power alternates between a positive voltage and a negative voltage relative to ground, and the RF converter includes a first terminal coupled to the load transistor and a second terminal coupled to the drive transistor, and the ac power waveform is applied across the first and second terminals. 17. The RFID tag of claim 1, further comprising a modulator coupled across the RF converter to modulate the ac power to convey information. 18. The RFID tag of claim 1, wherein the RF converter comprises an inductor and a capacitor coupled in parallel with the inductor, the inductor and the capacitor forming a resonant tank. 19. A radio frequency identification (RFID) system comprising: an RFID tag including first and second transistors arranged to form a logic gate, a radio frequency (RF) converter that converts RF energy to alternating current (ac) power and directly powers the logic gate with the ac power, and a modulator that conveys information; and an RFID reader that transmits the RF energy to the RFID tag for conversion by the RF converter, and reads the information conveyed by the modulator, wherein a waveform of the ac power has a period less than a propagation delay time of the logic gate. 20. The system of claim 19, wherein the logic gate includes one of an inverter, a NOR gate, and a NAND gate. 21. The system of claim 19, wherein the logic gate forms an analog amplifier. 22. The system of claim 19, further comprising a load capacitor coupled to an output of the logic gate. 23. The system of claim 22, wherein the logic gate is a first logic gate and the circuit further includes a second logic gate, wherein an output of the first logic gate drives an input of the second logic gate, and wherein the load capacitor is formed at least in part by an input capacitance of the second logic gate. 24. The system of claim 22, wherein the RFID tag includes a series of inverter stages, the inverter stages being coupled to form at least part of a ring oscillator. 25. The system of claim 24, further comprising: a plurality of data lines; and a plurality of logic gates that selectively output data from the data lines in response to a clock signal generated by the ring oscillator. 26. The system of claim 25, wherein the transistors include a plurality of thin film transistors arranged to form at least part of the logic gates. 27. The system of claim 19, wherein at least one of the transistors is an organic thin film transistor. 28. The system of claim 27, wherein at least one of the transistors is pentacene-based. 29. The system of claim 19, wherein at least one of the transistors is amorphous silicon-based. 30. The system of claim 19, wherein the logic gate comprises a CMOS logic gate. 31. The system of claim 19, wherein the transistors are formed on a flexible substrate. 32. The system of claim 19, wherein the first transistor is a load transistor and the second transistor is a drive transistor, and wherein a ratio of a gate width to a gate length of the load transistor is greater than or equal to a ratio of a gate width to a gate length of the drive transistor. 33. The system of claim 19, wherein the first transistor is a load transistor and the second transistor is a drive transistor, and the load transistor and the drive transistor are arranged to form the logic gate. 34. The system of claim 33, wherein the ac power alternates between a positive voltage and a negative voltage relative to ground, and the RF convener includes a first terminal coupled to the load transistor and a second terminal coupled to the drive transistor, and the ac power waveform is applied across the first and second terminals. 35. The system of claim 19, wherein the RF converter comprises an inductor and a capacitor coupled in parallel with The inductor, the inductor and the capacitor forming a resonant tank. 36. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; and an ac power source that directly powers the logic gate with ac power, wherein a waveform of the ac power has a period less than a propagation delay time of the logic gate. 37. The RFID tag of claim 36, wherein the first transistor is a load transistor and the second transistor is a drive transistor, and the load transistor and the drive transistor are arranged to form the logic gate. 38. The RFID tag of claim 37, wherein the ac power alternates between a positive voltage and a negative voltage relative to ground, and the ac power source includes a first terminal coupled to the load transistor and a second terminal coupled to the drive transistor, and the ac power waveform is applied across the first and second terminals. 39. The RFID tag of claim 36, further comprising a modulator coupled across the AC power source to modulate the ac power to convey information. 40. The RFID tag of claim 36, wherein the ac power source comprises an inductor and a capacitor coupled in parallel with the inductor, the inductor and the capacitor forming a resonant tank. 41. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; a radio frequency (RF) converter that converts RF energy to alternating current (ac) power, and directly powers the logic gate with the ac power; and a load capacitor coupled to an output of the logic gate, wherein the logic gate is a first logic gate and the circuit further includes a second logic gate, wherein an output of the first logic gate drives an input of the second logic gate, and wherein the load capacitor is formed at least in part by an input capacitance of the second logic gate. 42. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; and a radio frequency (RF) converter that converts RF energy to alternating current (ac) power, and directly powers the logic gate with the ac power, wherein the RFID tag includes a series of inverter stages, the inverter stages being coupled to form at least pan of a ring oscillator. 43. A radio frequency identification (RFID) system comprising: an RFID tag including first and second transistors arranged to form a logic gate, a radio frequency (RF) converter that converts RF energy to alternating current (ac) power and directly powers the logic gate with the ac power, and a modulator that conveys information; an RFID reader that transmits the RF energy to the RFID tag for conversion by the RF converter, and reads the information conveyed by the modulator; and a load capacitor coupled to an output of the logic gate, wherein the logic gate is a first logic gate and the circuit further includes a second logic gate, wherein an output of the first logic gate drives an input of the second logic gate, and wherein the load capacitor is formed at least in part by an input capacitance of the second logic gate. 44. A radio frequency identification (RFID) system comprising: an RFID tag including first and second transistors arranged to form a logic gate, a radio frequency (RF) converter that converts RF energy to alternating current (ac) power and directly powers the logic gate with the ac power, and a modulator that conveys information; and an RFID reader that transmits the RF energy to the RFID tag for conversion by the RF converter, and reads the information conveyed by the modulator, wherein the RFID tag includes a series of inverter stages, the inverter stages being coupled to form at least part of a ring oscillator. 45. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; an ac power source that directly powers the logic gate with ac power; and a load capacitor coupled to an output of the logic gate, wherein the logic gate is a first logic gate and the circuit further includes a second logic gate, wherein an output of the first logic gate drives an input of the second logic gate, and wherein the load capacitor is formed at least in part by an input capacitance of the second logic gate. 46. A radio frequency identification (RFID) tag comprising: a logic gate formed by at least a first transistor and a second transistor; and an ac power source that directly powers the logic gate with ac power, wherein the RFID tag includes a series of inverter stages, the inverter stages being coupled to form at least part of a ring oscillator.
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