Self-powered sensor
First Claim
Patent Images
1. A self-powered sensor, comprising:
- a piezoelectric transducer;
a non-volatile memory comprised of at least one floating gate transistor; and
a current reference circuit having a floating gate transistor operating in a weak-inversion mode, the current reference circuit adapted to receive a voltage signal from the piezoelectric transducer and operable to output an injection current into the non-volatile memory.
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Abstract
A self-powered sensor is provided for fatigue monitoring and other low power requirement applications. The self-powered sensor is comprised of: a piezoelectric transducer; a non-volatile memory comprised of at least one floating gate transistor; and a current reference circuit adapted to receive a voltage signal from the piezoelectric transducer and operable to output an injection current into the non-volatile memory. The current reference circuit may employ a floating gate transistor operating in a weak-inversion mode.
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Citations
19 Claims
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1. A self-powered sensor, comprising:
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a piezoelectric transducer; a non-volatile memory comprised of at least one floating gate transistor; and a current reference circuit having a floating gate transistor operating in a weak-inversion mode, the current reference circuit adapted to receive a voltage signal from the piezoelectric transducer and operable to output an injection current into the non-volatile memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A self-powered sensor, comprising:
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a current reference circuit adapted to receive a voltage signal and operable to output a reference current compensated for temperature variations; an array of floating gate transistors which provides non-volatile storage; and a driving circuit interposed between the current reference circuit and the array of floating gate transistors and operable to inject a charge into select transistors of the array of floating gate transistors based on a magnitude of the voltage signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A self-powered sensor, comprising:
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a piezoelectric transducer; a non-volatile memory comprised of at least one floating gate transistor; and a current reference circuit adapted to receive a voltage signal from the piezoelectric transducer and operable in a weak-inversion mode to output an injection current into the non-volatile memory, thereby recording output of the piezoelectric transducer.
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Specification