Method and circuit arrangement for holding a control state during inadequate power supply in an RF transponder or remote sensor
First Claim
1. A device comprising a circuit arrangement for an RF transponder, said circuit arrangement comprising:
- at least one power input adapted to have electrical operating power applied thereto;
at least one control input adapted to have at least one electrical control signal applied thereto;
a first storage arrangement that is connected to said at least one control input to receive said at least one control signal, and that is adapted to produce and store a control state of said circuit arrangement in response to and dependent on said control signal when said operating power applied to said power input is at or above an adequate level;
a second storage arrangement that is connected to a first output of said first storage arrangement to receive said control state, and that is adapted to hold said control state at least temporarily when said operating power applied to said power input is below said adequate level; and
a signal output arrangement configured to receive an output of said second storage arrangement and a second output of said first storage arrangement, and to provide an output signal,wherein the second output of said first storage arrangement is inverted with respect to the at least one control signal.
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Accused Products
Abstract
An RF transponder includes an input circuit, a read/memory circuit, and a circuit arrangement for holding a control state. The circuit arrangement includes a first storage device (e.g. a D-flip-flop) for storing the control state dependent on received control signals, and a second storage device (e.g. a capacitor and a transistor) for holding the control state during a period of inadequate energy supply to the circuit arrangement, e.g. while the transponder is in a field gap of the electromagnetic field emitted by a base station with which the transponder communicates. In an operating method, the control state is held by the second storage device during a period of inadequate energy supply. Then, when adequate energy is again supplied, the transponder resumes the control state that was held by the second storage device. The transponder continues to operate properly according to an anti-collision procedure in a system of several transponders communicating individually with a base station.
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Citations
27 Claims
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1. A device comprising a circuit arrangement for an RF transponder, said circuit arrangement comprising:
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at least one power input adapted to have electrical operating power applied thereto; at least one control input adapted to have at least one electrical control signal applied thereto; a first storage arrangement that is connected to said at least one control input to receive said at least one control signal, and that is adapted to produce and store a control state of said circuit arrangement in response to and dependent on said control signal when said operating power applied to said power input is at or above an adequate level; a second storage arrangement that is connected to a first output of said first storage arrangement to receive said control state, and that is adapted to hold said control state at least temporarily when said operating power applied to said power input is below said adequate level; and a signal output arrangement configured to receive an output of said second storage arrangement and a second output of said first storage arrangement, and to provide an output signal, wherein the second output of said first storage arrangement is inverted with respect to the at least one control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 20, 25, 26, 27)
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16. A system comprising a plurality of RF transponders each of said RF transponders comprising a circuit arrangement, said circuit arrangement comprising:
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at least one power input adapted to have electrical operating power applied thereto; at least one control input adapted to have at least one electrical control signal applied thereto; a first storage arrangement that is connected to said at least one control input to receive said at least one control signal, and that is adapted to produce and store a control state of said circuit arrangement in response to and dependent an said control signal when said operating power applied to said power input is at or above an adequate level; a second storage arrangement that is connected to a first output of said first storage arrangement to receive said control state, and that is adapted to hold said control state at least temporarily when said operating power applied to said power input is below said adequate level; and a signal output arrangement configured to receive an output of said second storage arrangement and a second output of said first storage arrangement, and to provide an output signal, wherein the second output of said first storage arrangement is inverted with respect to the at least one control signal; and a base station adapted to emit said RF electromagnetic wave.
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19. A system comprising a plurality of RF remote sensors, each of said RF remote sensors comprising a circuit arrangement, said circuit arrangement comprising:
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at least one power input adapted to have electrical operating power applied thereto; at least one control input adapted to have at least one electrical control signal applied thereto; a first storage arrangement that is connected to said at least one control input to receive said at least one control signal, and that is adapted to produce and store a control state of said circuit arrangement in response to and dependent on said control signal when said operating power applied to said power input is at or above an adequate level; a second storage arrangement that is connected to a first output of said first storage arrangement to receive said control state, and that is adapted to hold said control state at least temporarily when said operating power applied to said power input is below said adequate level; and a signal output arrangement configured to receive an output of said second storage arrangement and a second output of said first storage arrangement, and to provide an output signal, wherein the second output of said first storage arrangement is inverted with respect to the at least one control signal; and a base station adapted to emit said RF electromagnetic wave.
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21. An RF transponder device comprising a circuit arrangement that includes;
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a flip-flop including at least one control input and a first control state output and a second control state output that is inverted with respect to the first control state output; an energy storage arrangement including a capacitor configured to receive at least indirectly a signal from said first control state output; a transistor switching stage connected to said energy storage arrangement; and a logic gate interposed between said transistor switching stage and a signal output of said circuit arrangement, wherein the logic gate configured to receive a first signal corresponding to the first control state output and a second signal corresponding to the second control state output. - View Dependent Claims (22, 23, 24)
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Specification