Method and apparatus with adaptive transponder plucking
AssigneeTexas Instruments Incorporated
InventorThomas J. Flaxl
Life of this patent
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Abstract
A method and apparatus with adaptive transponder plucking is provided in which oscillations from a resonant circuit (12 and 14) are maintained by coupling power from a capacitor (18) through a switch (26) to the resonant circuit (12 and 14). The switch (26) is controlled by adaptive pluck circuitry. The adaptive pluck circuitry includes peak level detector (22) and comparator (24). When the peak level of an oscillating signal from the resonant circuit (12 and 14) falls below a reference voltage, the switch (26) is activated to couple power to the resonant circuit (12 and 14).
Claims17
A system with adaptive plucking, comprising:
- a resonant circuit operable to generate an oscillating signal;
- a peak level detector operable to detect a peak level of said oscillating signal;
- a comparator coupled to said peak level detector and operable to compare said peak level with a reference voltage;
- and
- a switch coupled to said resonant circuit and said comparator, said switch operable to couple power to said resonant circuit under control of said comparator.
A system with adaptive plucking, comprising:
- a resonant circuit operable to generate an oscillating signal;
- a peak level detector operable to detect a peak level of said oscillating signal;
- a comparator coupled to said peak level detector and operable to compare said peak level with a reference voltage;
- a counter operable to count cycles of said oscillating signal;
- and
- a switch coupled to said resonant circuit, said comparator, and said counter, said switch operable to couple power to said resonant circuit under control of said comparator and said counter.
A method of maintaining an oscillating signal with adaptive plucking, comprising:
- initiating the oscillating signal in a resonant circuit;
- detecting a peak level of the oscillating signal;
- comparing the peak level with a reference voltage;
- and
- coupling power to the resonant circuit in response to said step of comparing.
Dependencies are inferred from the claim text.