Responder unit for transponder arrangement
First Claim
1. A responder unit for communicating with an interrogator unit which sends an RF interrogation pulse thereto, said responder unit comprising:
- a) an energy accumulator which stores the energy contained in said RF interrogation pulse;
b) a responder unit memory for storing read data;
c) a RF threshold detector for detecting termination of said RF interrogation pulse;
d) a responder unit RF carrier wave generator under control of said RF threshold detector and operable to activate upon said detection of said termination of said RF interrogation pulse; and
e) a responder unit modulator to modulate the RF carrier with said read data from said responder unit memory.
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Accused Products
Abstract
A responder unit for communicating with an interrogator unit which sends an RF interrogation pulse thereto is described. The responder unit includes an energy accumulator which stores the energy contained in the RF interrogation pulse to be used to power the responder unit in the absence of any RF interrogation signal. The responder unit also has a memory for storing read data and a RF threshold detector for detecting termination of the RF interrogation pulse. A RF carrier wave generator under control of the RF threshold detector is operable to activate upon detection of the termination of the RF interrogation pulse. A modulator is provided in the responder unit to modulate the RF carrier with the read data from the memory.
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Citations
9 Claims
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1. A responder unit for communicating with an interrogator unit which sends an RF interrogation pulse thereto, said responder unit comprising:
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a) an energy accumulator which stores the energy contained in said RF interrogation pulse; b) a responder unit memory for storing read data; c) a RF threshold detector for detecting termination of said RF interrogation pulse; d) a responder unit RF carrier wave generator under control of said RF threshold detector and operable to activate upon said detection of said termination of said RF interrogation pulse; and e) a responder unit modulator to modulate the RF carrier with said read data from said responder unit memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A responder unit for communicating with an interrogator unit which sends an RF interrogation pulse thereto, said responder unit comprising:
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a) an energy accumulator which stores the energy contained in said RF interrogation pulse, said energy accumulator being a parallel resonant circuit comprising a coil and a capacitor; b) a responder unit memory for storing read data, said read data comprising a responder unit address; c) a responder unit demodulator for receiving said at least one interrogation signal from said interrogation unit and determining the address provided therein; d) a data processor for enabling said responder unit to send back stored data to said interrogation unit in response to a comparison between the address as determined by said demodulator with the address stored in said memory establishing identity of the compared addresses; e) a RF threshold detector for detecting termination of said RF interrogation pulse; f) a responder unit RF carrier wave generator under control of said RF threshold detector and operable to activate upon said detection of said termination of said RF interrogation pulse; g) circuitry operably connected to the output of said carrier wave generator for producing a control signal for maintaining and modulating the carrier wave; h) a responder unit FSK modulator to FSK modulate the RF carrier with said read data from said responder unit memory; i) a shift register connected between said memory and said modulator; j) a divider circuit for receiving said control signal and generating therefrom a clock signal at a lower recurring frequency; k) a counter operably connected to said memory circuitry for counting the clock pulses derived from said carrier wave and for applying said divided carrier wave to said memory circuitry; and l) a counter incrementing in response to each of the carrier wave clock pulses applied to said memory and being responsive to a predetermined number of pulses indicative of the entry of all the data from said memory into said shift register to apply the clock signal generated by said divider circuit to said shift register instead of the clock signal derived from the carrier wave.
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Specification