RADIO FREQUENCY IDENTIFICATION TAG AND LOW DROPOUT REGULATOR (LDO) CIRCUIT CONSUMING ULTRA-LOW POWER

摘要

A radio frequency identification (RFID) tag and a low dropout regulator (LDO) circuit consuming ultra-low power. The circuit is connected to a first threshold unit and a second threshold unit respectively and in series at a first voltage dividing resistor (R1) bypass and a second voltage dividing resistor (R2) bypass; utilizes the inherent threshold property of a unidirectional conductive diode or a MOS tube in the threshold units, and the voltage difference between the positive input terminal of an error-correction differential amplifier and a voltage output terminal (Vout), and the voltage differences between the voltage of the positive input terminal to the voltage output terminal and the voltage of the positive input terminal to a ground wire terminal of the error-correction differential amplifier are respectively borne by the threshold units; therefore, the remaining voltage on a resistor connected in the circuit in series will be a small value, thus effectively reducing the power consumption of the resistor. Furthermore, compared with a normal structure using a resistor alone, the structure connecting a diode or an MOS tube in series in a resistor bypass can greatly reduce the overall area of a chip under the same power consumption, thus reducing cost.