RECTIFIER CIRCUIT SUITABLE FOR AMPLITUDE-MODULATED SIGNAL ADOPTING PULSE WIDTH MODULATION, AND PASSIVE RADIO FREQUENCY TAG

摘要

A rectifier circuit suitable for an amplitude-modulated signal adopting a pulse width modulation, and passive radio frequency tag. A one-way conduction unit is connected between an output end of a rectifier circuit and an input end of a load circuit and a positive electrode end of an energy storage capacitor (C1). The one-way conduction unit is a one-way conduction switch in a direction from the rectifier circuit to the load circuit and the energy storage capacitor (C1). When a radio frequency field energy is at a wave peak, a rectified current passes through the one-way conduction unit and is input to the load circuit and the energy storage capacitor (C1) to supply power to the load circuit for operation, and the energy storage capacitor (C1) stores the charges. When the radio frequency field energy is at a wave trough, the energy storage capacitor (C1) is discharged to the outside. Since the one-way conduction unit is in a strict reverse shutdown state, the charges cannot reversely flow to the rectifier circuit and a coil port, thus avoiding a loss of energy storage charges, improving a utilization rate of the energy storage charges, reducing a number of energy storage capacitors used, and reducing a cost of a tag chip while ensuring a sensitivity of the tag chip.