High speed read/write AVI system
First Claim
1. A transponder for communicating with an interrogator unit, said transponder comprising:
- a) a high Q-factor resonant circuit of frequency f1 for receiving RF powering signals;
b) a tuning circuit which when in electrical communication with said resonant circuit is operable to form a lower Q-factor resonant circuit of frequency f3 for receiving RF communications from said interrogator unit;
c) a control circuit which is in electrical communication with said high Q-factor resonant circuit and said tuning circuit and is operable to connect said tuning circuit to said high Q-factor resonant circuit in order to form said lower Q-factor resonant circuit, said control circuit further operable to convert said RF powering signals to a DC current for storing energy, said control circuit still further operable to demodulate signals received by said lower Q-factor resonant circuit; and
d) an energy storage device for storing the energy received in said DC current from said control circuit.
3 Assignments
0 Petitions
Accused Products
Abstract
A transponder (14) for communicating with an interrogator (12) has a high Q-factor resonant circuit (34) of frequency f1 for receiving RF powering signals. The transponder also has a tuning circuit (56,58) which when in electrical communication with the resonant circuit (34) is operable to form a lower Q-factor resonant circuit (60) of frequency f3 for receiving RF communications from the interrogator unit. The transponder also includes a demodulator (66) which is in electrical communication with said resonant circuit (34). Additionally, the transponder (14) also included a control circuit (40) which receives a demodulated data signal from the demodulator (66). The control circuit (40) is further connected to the tuning circuit (56,58) and is operable to connect the tuning circuit (56,58) to the high Q-factor resonant circuit (34) in order to form the lower Q-factor resonant circuit (60). Control circuit (40) also converts the RF powering signals to a DC current for storing energy. The energy is stored in an energy storage device such as a storage capacitor (46). Other devices, methods and systems are disclosed.
383 Citations
16 Claims
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1. A transponder for communicating with an interrogator unit, said transponder comprising:
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a) a high Q-factor resonant circuit of frequency f1 for receiving RF powering signals; b) a tuning circuit which when in electrical communication with said resonant circuit is operable to form a lower Q-factor resonant circuit of frequency f3 for receiving RF communications from said interrogator unit; c) a control circuit which is in electrical communication with said high Q-factor resonant circuit and said tuning circuit and is operable to connect said tuning circuit to said high Q-factor resonant circuit in order to form said lower Q-factor resonant circuit, said control circuit further operable to convert said RF powering signals to a DC current for storing energy, said control circuit still further operable to demodulate signals received by said lower Q-factor resonant circuit; and d) an energy storage device for storing the energy received in said DC current from said control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15, 16)
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10. An interrogator for communicating with a transponder, said interrogator comprising:
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a) a programmable carrier wave generator capable of providing a carrier of a first frequency, f1, or a second frequency, f2 ; b) a first resonant circuit having a resonant frequency of said first frequency, f1 ; c) a tuning circuit which when in electrical communication with said resonant circuit is operable to form a second resonant circuit having a resonant frequency of said second frequency, f2 ; and d) a modulator which is in electrical communication with said tuning circuit and said programmable carrier wave generator, said modulator operable to toggle the frequency of said carrier wave generator in response to a received data stream and to synchronously enable or disable said tuning circuit such that when said programmable carrier wave generator is providing frequency f1, said tuning circuit is disabled and said first resonant circuit is tuned to said resonant frequency, f1, and when said programmable carrier wave generator is providing frequency, f2, said tuning circuit is enabled and said second resonant circuit is tuned to said resonant frequency, f2. - View Dependent Claims (11, 12, 13)
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14. A method for communicating between an interrogator and a transponder, said method comprising the steps of:
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a) sending by said interrogator a powering signal from a first high Q-factor resonant circuit having a resonant frequency of f1 ; b) receiving by said transponder said powering signal on a second high Q-factor resonant circuit having a resonant frequency of f1 ; c) receiving by a transponder control circuit said powering signal from said second high Q-factor resonant circuit; d) storing energy from said powering signal in an energy storage device; e) connecting by said transponder control circuit a tuning circuit to said second high Q-factor resonant circuit to form a lower Q-factor resonant circuit having a resonant frequency of f3 ; f) transmitting by said interrogator unit a FSK-modulated communicating signal with a center frequency of f3, said FSK-modulated communicating signal having an occupied frequency spectrum which falls substantially within the frequency response of the lower Q-factor resonant circuit, said communicating signal generated by modifying the resonant frequency of said first high Q-factor resonant circuit; g) receiving by said transponder lower Q-factor resonant circuit said FSK-modulated communicating signal; h) demodulating by said transponder control circuit said FSK modulated communicating signal; i) disconnecting by said transponder control circuit said tuning circuit to re-establish said second high Q-factor resonant circuit; and j) responding to said interrogator by said transponder by modulating said second high Q-factor resonant circuit.
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Specification