Random Delay Generation for Thin-Film Transistor Based Circuits
First Claim
1. A circuit configured to generate a delay comprising:
- a) a delay element having an input terminal and an output terminal;
b) a capacitor having a first terminal receiving an input and a second terminal coupled to said input of said delay element; and
c) a thin-film field-effect transistor (TFT) having a first and second source/drain terminals and a gate, configured to provide a current and/or voltage to said capacitor,wherein said current and/or voltage has a value that falls randomly within a predetermined range.
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Accused Products
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 are disclosed. 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.
24 Citations
30 Claims
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1. A circuit configured to generate a delay comprising:
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a) a delay element having an input terminal and an output terminal; b) a capacitor having a first terminal receiving an input and a second terminal coupled to said input of said delay element; and c) a thin-film field-effect transistor (TFT) having a first and second source/drain terminals and a gate, configured to provide a current and/or voltage to said 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)
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7. A monostable oscillator, comprising:
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a) a capacitor; b) a resistive element providing a current and/or voltage to a first electrode of the capacitor; and c) a feedback path; wherein said current and/or voltage has a value that falls randomly within a predetermined range. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A circuit configured to broadcast a repetitive message in a wireless system, comprising:
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a) an antenna configured to receive a power transmission and broadcast a repetitive message; b) a power-up circuit providing an initiation signal; c) a monostable oscillator configured to provide a repeating timing signal; d) a memory element providing said message; and e) an output circuit configured to broadcast said message in response to said timing signal. - View Dependent Claims (15, 16, 17, 18)
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19. An wireless system comprising at least two wireless devices, each wireless device comprising:
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a) an antenna configured to receive a power transmission and broadcast a repetitive identification message; b) a power converting element coupled to said antenna; and c) a circuit configured to generate said repetitive identification message, said circuit comprising at least one thin film transistor (TFT) configured to introduce a random delay in said repetitive identification message. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of forming a collision tolerant wireless system comprising the steps of:
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a) determining a target variation range in the broadcast delay of a plurality of wireless devices having substantially the same architecture, the target variation range being configured to reduce a broadcast collision frequency between said wireless devices when said wireless devices broadcast repetitive messages in the same read field; b) determining a random variation range in the broadcast delay of said wireless devices; c) comparing said target variation range and said random variation range; and d) if said random variation range is at least equal to said target variation range, making said wireless devices having said random variation range in their broadcast delay. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification