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Clamping circuit for electronic tag of RFID (radio frequency identification) system

An electronic label, clamp circuit technology, applied in the field of clamp circuit, can solve the problems of complex process, high cost and so on

Active Publication Date: 2014-07-09
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the rectifier uses a 15V high-voltage device, so the design is relatively simple, but the cost is that more complex processes and higher costs must be used

Method used

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  • Clamping circuit for electronic tag of RFID (radio frequency identification) system
  • Clamping circuit for electronic tag of RFID (radio frequency identification) system
  • Clamping circuit for electronic tag of RFID (radio frequency identification) system

Examples

Experimental program
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Effect test

Embodiment Construction

[0024] see figure 2 The clamping circuit of the present invention is between the input of the antenna induced voltage and the rectifier in the radio frequency analog front-end circuit. The clamping circuit can limit the voltage value of the induced voltage on the antenna at the maximum field strength within 5 volts.

[0025] see image 3 , The clamping circuit of the electronic tag of the RFID system of the present invention includes two resistors R1, R2, one PMOS transistor Mp1, two NMOS transistors Mn1, Mn2. The antenna induction voltage VRF of the electronic tag is connected to the source of the first PMOS transistor Mp1 through the first resistor R1. The gate of the first PMOS transistor Mp1, the drain of the first PMOS transistor Mp1, the drain of the first NMOS transistor Mn1, and the gate of the first NMOS transistor Mn1 are connected to each other. The source of the first NMOS transistor Mn1 is grounded through the second resistor R2, and the source of the first NM...

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Abstract

The invention discloses a clamping circuit for the electronic tag of a RFID (radio frequency identification) system, comprising two resistors, a PMOS (P-channel metal oxide semiconductor) transistor and two NMOS (N-channel metal oxide semiconductor) transistors. The induced voltage of the antenna of the electronic tag is connected with the source of the first PMOS via the first resistor. The grid of the first PMOS, the drain of the first PMOS, the drain of the first NMOS and the grid of the first NMOS are connected. The source of the first NMOS is grounded via the second resistor and further connected with the grid of the second NMOS. The source of the second NMOS is grounded, and the drain of the second NMOS is used as an output end. A rectifier for the RFID electronic tag can be designed by a 5V apparatus instead of a non-high-voltage-resistant 15V apparatus via the clamping circuit for the electronic tag of a RFID system disclosed by the invention, thereby decreasing the manufacturing cost of an electronic tag chip.

Description

technical field [0001] The invention relates to a radio frequency analog front-end circuit of an electronic tag of an RFID system, in particular to a clamping circuit in the radio frequency analog front-end circuit. Background technique [0002] RFID (radio frequency identification, radio frequency identification) is a non-contact automatic identification technology. An RFID system includes at least two parts: a transponder and an interrogator. The transponder is also called the electronic tag (tag). An interrogator, also known as a reader, is a device that reads and / or writes electronic tags. [0003] The electronic tag usually includes an antenna, a radio frequency analog front-end circuit, a digital baseband circuit, and a storage unit. The performance of the entire RFID tag is closely related to the design of the analog front-end circuit, and there are various design circuit structures. see figure 1 , the conventional RF analog front-end circuit mainly includes: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
Inventor 朱红卫彭敏
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP