Patent ID: 6480699
Filing Date: 2002-11-12
Classification: G06K

Abstract:
A device comprising:a power supply having a power input terminal and a power supply line, the power supply including an energy store coupled between the power input terminal and the power supply line; and a signal transmitter having a reference voltage terminal, a data input line and a signal output terminal, the reference voltage terminal being coupled to the power supply line, the signal transmitter drawing stored energy from the energy store and using the stored energy to supply an electrical signal to the signal output terminal; and a single antenna, tie single antenna being coupled to each of the power input terminal and the signal output terminal, and wherein each of the power supply and the signal transmitter are formed in a single integrated circuit die; and wherein the single antenna is formed in the single integrated circuit, and the device is devoid of any bond pads; and wherein the energy store stores at least a portion of energy rectified from a first radio frequency signal received by the single antenna during an absorption period; and wherein the single antenna transmits, during a transmission period, a second radio frequency sign, the transmission period being at least an order of magnitude smaller than the absorption period.