ESD (Electro-Static Discharge) protective circuit suitable for RFID (Radio Frequency Identification Devices) and RFID chip

Abstract

The invention discloses an ESD (Electro-Static Discharge) protective circuit suitable for RFID (Radio Frequency Identification Devices). The ESD protective circuit comprises a GC-GGNMOS (Gate Coupled Gate Grounded N-channel Metal Oxide Semiconductor), wherein the GC-GGNMOS takes a stray capacitor in an inherent grid and drain overlapped region as a coupling capacitor, and the RC parameters of the GC-GGNMOS are regulated by changing the resistance value of a polycrystalline silicon resistor which connects the grid to the ground. The invention also discloses an RFID chip, and the RFID chip comprises packaged pins, an RFID chip internal circuit and the ESD protective circuit which is positioned between the packaged pins and the RFID chip and has a protective effect, wherein the ESD protective circuit comprises the GC-GGNMOS, the GC-GGNMOS takes the stray capacitor in the inherent grid and drain overlapped region as the coupling capacitor, and the RC parameters of the GC-GGNMOS are regulated by changing the resistance value of the polycrystalline silicon resistor which connects the grid to the ground. The embodiment of the invention reduces the robustness index of the protective circuit and reduces the robustness of the protective circuit.

Description

technical field [0001] The invention relates to the technical field of RFID, in particular to an electrostatic discharge ESD protection circuit and an RFID chip suitable for RFID. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology, which transmits signals through electromagnetic waves or inductive coupling to complete automatic identification of target objects. Compared with other automatic identification technologies such as barcodes, magnetic cards, and contact IC cards, RFID technology has the advantages of no manual intervention in the identification process, multiple targets can be identified at the same time, a large amount of information storage, and it can work in various harsh environments. Therefore, RFID technology has been widely used in fixed asset management, production line automation, animal and vehicle identification, road toll collection, access control system, warehousing, com...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiency of the function of the existing GGNMOS protection circuit, the present invention provides an ESD protection circuit and RFID chip suitable for RFID, which can solve the problems encountered in traditional ESD protection and improve the performance of ESD protection

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