Random delay generation for thin-film transistor based circuits
First Claim
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1. A monostable oscillator, comprising:
- a) a capacitor having a first terminal receiving an input and a second terminal coupled to an input of a delay element;
b) a thin-film field-effect transistor (TFT) having a first source/drain terminal receiving a DC source or supply voltage, a second source/drain terminal coupled to said input of said delay element, and a gate electrically connected to said second source/drain terminal, said TFT being configured to provide a current and/or voltage to said second terminal of the capacitor; and
c) a feedback path comprising the delay element, wherein the delay element comprises (i) an XOR gate or an XNOR gate and (ii) an output terminal, and the output terminal of the delay element is coupled to the first terminal of the capacitor;
wherein said current and/or voltage has a value that falls randomly within a predetermined range.
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Abstract
Circuits and circuit elements configured to generate a random delay, a monostable oscillator, circuits configured to broadcasting repetitive messages wireless systems, and methods for forming such circuits, devices, and systems. The present invention advantageously provides relatively low cost delay generating circuitry based on TFT technology in wireless electronics applications, particularly in RFID applications. Such novel, technically simplified, low cost TFT-based delay generating circuitry enables novel wireless circuits, devices and systems, and methods for producing such circuits, devices and systems.
21 Citations
20 Claims
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1. A monostable oscillator, comprising:
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a) a capacitor having a first terminal receiving an input and a second terminal coupled to an input of a delay element; b) a thin-film field-effect transistor (TFT) having a first source/drain terminal receiving a DC source or supply voltage, a second source/drain terminal coupled to said input of said delay element, and a gate electrically connected to said second source/drain terminal, said TFT being configured to provide a current and/or voltage to said second terminal of the capacitor; and c) a feedback path comprising the delay element, wherein the delay element comprises (i) an XOR gate or an XNOR gate and (ii) an output terminal, and the output terminal of the delay element is coupled to the first terminal of the capacitor; wherein said current and/or voltage has a value that falls randomly within a predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A monostable oscillator, comprising:
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a) a capacitor having a first terminal receiving an input and a second terminal coupled to an input of a delay element; b) a thin-film field-effect transistor (TFT) having a first source/drain terminal receiving a DC source or supply voltage, a second source/drain terminal coupled to said input of said delay element, and a gate electrically connected to said second source/drain terminal, said TFT being configured as a pull-up resistive element configured to provide a current and/or voltage to said second terminal of the capacitor; and c) a feedback path comprising the delay element, wherein the delay element comprises one or more inverters and an output terminal, and the output terminal of the delay element is coupled to the first terminal of the capacitor; wherein said current and/or voltage has a value that falls randomly within a predetermined range. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification