Patent ID: 11893438
Assignee: EXCELIO TECHNOLOGY (SHENZHEN) CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The positive feedback latch amplitude limiting control circuit of the RFID tag according to claim 1, wherein the signal generating circuit includes a first current source I1, a first resistive device and a second resistive device that are connected in series between a power supply terminal and the ground, wherein: the first control signal S1 is outputted from a node between the first current source I1 and the first resistive device, a gate of a first N-type MOS transistor is connected to an output terminal of the signal processing circuit, a drain thereof is connected to a node between the first resistive device and the second resistive device, and a source thereof is connected to a node between the second resistive device and the ground; and a resistance value of the first resistive device is much smaller than a resistance value of the second resistive device; and
the discharge circuit includes a MOS transistor whose gate is controlled, and source and drain thereof are respectively connected between the power supply terminal and the ground, wherein: when the strength of the magnetic field coupled to the coil of the passive RFID tag is less than the preset value, the first control signal S1 is pulled down to the ground to maintain the discharge circuit in the turned-off state; and when the strength of the magnetic field coupled to the coil of the passive RFID tag is greater than the preset value, the first control signal S1 is set to the high level to turn on the discharge circuit, and charges at the output terminal of the rectifier circuit are outputted to the ground.