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Power-on reset circuit for rfid tags

A technology of RFID tags and electric reset, which is applied to record carriers used in machines, instruments, computer components, etc., and can solve problems such as changes in drain-source resistance, large power consumption, and large power consumption in circuit structures

Active Publication Date: 2011-12-07
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the power consumption of this circuit structure will be relatively large, because after the pulse is generated, the two PMOS tubes will always have a DC current
image 3 The structure shown can solve the problem of high power consumption, but this structure is not convenient for use in chips with low power supply voltage, and the drain-source resistance of the two cascaded tubes will change, and the maximum value can reach twice the minimum value

Method used

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  • Power-on reset circuit for rfid tags
  • Power-on reset circuit for rfid tags
  • Power-on reset circuit for rfid tags

Examples

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Embodiment Construction

[0026] The invention provides a power-on reset circuit of an RFID tag, such as Figure 4 As shown, it includes a power-on reset signal generating circuit and a power-on reset signal processing circuit. In the power-on reset signal generating circuit, the enabling terminal enb is connected to the gates of the first PMOS transistor M1 and the second NMOS transistor M2, and the RFID tag The rectified and stabilized power supply avdd is connected to the source of the first PMOS transistor M1, and the drains of the first PMOS transistor M1 and the second NMOS transistor M2 are connected to the first end of the resistor R1 through series-connected diodes D1 and D2. , the current direction of the two series-connected diodes D1 and D2 is directed from the drain of the first PMOS transistor M1 to the resistor R1, and the drain of the first PMOS transistor M1 is also connected to the fourth, fifth and sixth PMOS transistors M4, M5 , the source of M6, the gate of the fifth PMOS transisto...

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Abstract

The invention discloses a power on reset circuit of an RFID (Radio Frequency Identification) tag, comprising a power on reset signal generating circuit and a power on reset signal processing circuit; the power on reset signal generating circuit is used for generating a pulse according to the increase of supply voltage; and the power on reset signal processing circuit is used for delaying and deburring a signal output by the power on reset signal generating circuit, and outputting the processed power on reset signal. The power on reset circuit of the RFID tag can output a valid pulse wave when an input voltage is in a set threshold voltage range, and the width of the pulse is adjustable; an input signal is controlled by a clamping circuit before entering the circuit so that the input voltage is not too high; the power on speed of the voltage can be controlled by adjusting the size of a resistor R1; and the whole conduction current is 0 after the pulse passes so that the purpose of lower power consumption is achieved.

Description

technical field [0001] The invention relates to a power-on reset circuit, in particular to a power-on reset circuit for RFID tags. Background technique [0002] An existing RFID tag includes an antenna, a radio frequency analog front end, a digital baseband and a storage unit. Designing a good RFID tag is a challenge to the manufacturing process and circuit design, because the RFID tag requires extremely low power consumption, a stable DC power supply, and a large dynamic range. All these key indicators are closely related to the design of the RF analog front-end circuit, so it is necessary to carefully design a high-performance RF analog front-end circuit, which can not only meet the short-distance high-voltage chip reliability requirements, but also achieve long-distance sensitive and stable Function. [0003] The RFID system consists of three parts: [0004] Tag (Tag, that is, radio frequency card): It is composed of a coupling element and a chip. The tag contains a bu...

Claims

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Application Information

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