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A radio frequency identification device comprises an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integrated circuit including the receive

A radio frequency identification device comprises an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integrated circuit including the receiver, the transmitter, and the microprocessor. Because the device includes an active transponder, instead of a transponder which relies on magnetic coupling for power, the device has a much greater range.

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1. A method of generating a pseudo random number, the method comprising:providing a linear feedback shift register;generating, with an oscillator, clock signals for use by the linear feedback shift register for shifting; andproviding a first voltage to the oscillator when a pseudo random number is r

1. A method of generating a pseudo random number, the method comprising:providing a linear feedback shift register;generating, with an oscillator, clock signals for use by the linear feedback shift register for shifting; andproviding a first voltage to the oscillator when a pseudo random number is required, and providing a second voltage lower than the first voltage to the oscillator at other times. 2. A method of generating a pseudo random number, the method comprising:providing a linear feedback shift register;generating, using an oscillator, clock signals for use by the linear feedback shift register for shifting;operating the oscillator at a first frequency in response to a request for a pseudo random number;operating the oscillator at a second frequency lower than the first frequency after the pseudo random number is generated; andusing the clock signals, in the linear feedback shift register, to shift data. 3. A method in accordance with claim 2 and further comprising supplying power to the oscillator from a thermal voltage generator to cause the oscillator to operate at the second frequency. 4. A system comprising:a microprocessor operating at a frequency;a linear feedback shift register operable in a first power mode, wherein the shift register operates at a frequency below the frequency of the microprocessor, and a second power mode wherein the shift register consumes more power than in the first power mode, operates at the frequency of the microprocessor, and shifts data into the microprocessor. 5. A radio frequency identification device comprising:an integrated circuit including a receiver, a transmitter, a thermal voltage generator, a microprocessor having an operating frequency, a linear feedback shift register operable in a first power mode, wherein the shift register operates at a frequency below the frequency of the microprocessor, and a second power mode wherein the shift register consumes more power than in the first power mode, operates at the frequency of the microprocessor, and shifts data into the microprocessor, an oscillator configured to supply clock signals to the shift register, and current mirrors configured to supply current to each stage of the shift register, the current mirrors being configured to be referenced to the thermal voltage generator when the shift register is in the first power mode, and, when the shift register is in the second power mode, connected to a supply voltage greater than the potential provided by the thermal voltage generator. 6. A method of generating a pseudo random number using a linear feedback shift register having multiple stages, the method comprising:generating a voltage using a thermal voltage generator;supplying clock signals to a linear feedback shift register using an oscillator;supplying current to each stage of the linear feedback shift register using current mirrors;referencing the current mirrors to the thermal voltage generator when no pseudo random number is required; andcoupling the current mirrors to a supply voltage greater than the voltage provided by the thermal voltage generator when a pseudo random number is required.