Patent ID: 6211786
Filing Date: 2001-04-03
Classification: G06K

Abstract:
A battery-free circuit device for RF identifying tag comprising:a signal process circuit having an output, the signal process circuit providing time sequence modified signals;a resonator that includes an antenna which resonates the signals received by the antenna,a voltage-charging rectifier circuit which is coupled to the resonator and is used to rectify the signals received by the antenna,a control computational circuit which is coupled to the voltage-charging rectifier circuit and the signal process circuit and is used to computationally control the modified wave form signals and is also used to control the operation of the battery-free circuit device for RF identifying tag,a frequency divider which is connected to the output of the signal process circuit and the control computational circuit and is used to divide the frequency of the time sequence modified signal, under the control of the control computational circuit,a shift register which is connected to the frequency divider and the control computational circuit and is used to load the signals that are then returned to the signal process circuit and finally emitted from the antenna;a capacitor that is coupled to ground;a voltage limiter that is connected in parallel with the capacitor; andwherein the voltage-charging rectifier circuit includes two diodes, with the p-terminal of a first diode coupled to the n-terminal of a second diode, with the p-terminal of the second diode coupled to ground, and with the n-terminal of the first diode coupled to the voltage limiter.