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Circuit for transmitting a RFID signal

  • US 8,446,255 B2
  • Filed: 11/19/2010
  • Issued: 05/21/2013
  • Est. Priority Date: 11/19/2010
  • Status: Active Grant
First Claim
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1. A circuit for transmitting a RFID signal while conserving the battery power for the circuit, the circuit comprising:

  • a battery having no more than 225 milliamp hours of powera microprocessor in electrical communication with the battery, the microprocessor operating during a sleep mode, a sampling mode, an analysis mode, a monitoring mode and a transmission mode;

    a multi-axis accelerometer for determining movement, monitoring movement and communicating the movement to the microprocessor, the multi-axis accelerometer in electrical communication with the microprocessor, the power for the multi-axis accelerometer drawn from the battery, the multi-axis accelerometer only active during the sampling mode, the analysis mode and the monitoring mode;

    a gyroscope in electrical communication with the accelerometer, the gyroscope only activated when triggered by the multi-axis accelerometer;

    a radiofrequency component in electrical communication with the microprocessor, the radiofrequency component operating at 2.4 giga-Hertz, the power for the radiofrequency component drawn from the battery, the radiofrequency component only operable during a transmission mode, transmitting a signal from the radiofrequency component during the transmission mode,wherein the circuit is in continuous operation;

    wherein the circuit consumes less than 600 nano-amps during the sleep mode, the sleep mode having a time period ranging from 5 seconds to 45 seconds, the accelerometer deactivated during the sleep mode;

    wherein the circuit consumes less than 15 micro-amps during the sampling mode, the microprocessor activating the accelerometer during the sampling mode and the accelerometer determining if there is any movement or change from a last sampling mode;

    wherein the circuit consumes less than 50 micro-amps during the analysis mode, the accelerometer determining if there is motion activity during the analysis mode;

    wherein the circuit consumes less than 200 micro-amps during the monitoring mode, the accelerometer monitoring the motion activity during the monitoring mode and communicating any motion activity to the microprocessor; and

    wherein the circuit consumes less than 12 milli-amps during the transmission mode, the radiofrequency component transmitting a signal during the transmission mode.

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