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Thyristor for electrostatic protection

An electrostatic protection, thyristor technology, applied in the direction of thyristor, can solve the problems of inability to reduce the risk of Latch-up, low protection reliability, and high misoperation rate, to overcome low protection reliability, high protection reliability, and misoperation. low rate effect

Active Publication Date: 2015-06-24
单毅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this structure is that under the normal working condition of the chip, if a Latch-up current flows into the anode, the SCR is easily triggered by mistake and the circuit is in the Latch-up state.
[0007] As can be seen from the above introduction, some existing SCRs have too high a trigger voltage to effectively realize ESD protection, and although some have a relatively low trigger voltage, they still cannot reduce the risk of Latch-up during normal operation.
[0008] In the process of realizing the present invention, the inventor found that there are at least defects such as low protection reliability, high misoperation rate and poor security in the prior art

Method used

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  • Thyristor for electrostatic protection
  • Thyristor for electrostatic protection
  • Thyristor for electrostatic protection

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Embodiment Construction

[0026] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0027] According to an embodiment of the present invention, such as image 3 As shown, a thyristor for electrostatic protection is provided, that is, a novel thyristor circuit design for electrostatic protection.

[0028] The purpose of the present invention is to design a high-efficiency SCR used as an ESD protection circuit. On the one hand, it has a lower trigger voltage, and on the other hand, it can reduce the risk of Latch-up during normal operation.

[0029] image 3 It is the technical scheme of the present invention. In general applications, the cathode of the SCR is grounded, and the anode is connected to the signal PAD or the power supply VDD. When no ...

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Abstract

The invention discloses a thyristor for electrostatic protection. The thyristor comprises a first NMOS tube M2, a second NMOS tube M3, a first PMOS tube M1, a second PMOS tube M4, a PNP tube T1, an NPN tube T2 and a pull-down resistor RPWELL. By means of the thyristor for electrostatic protection, the defects that in the prior art, the protection reliability is low, the misoperation rate is high, and the safety performance is poor can be overcome, and the advantages of being high in protection reliability, low in misoperation rate and good in safety are achieved accordingly.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a thyristor for electrostatic protection. Background technique [0002] Silicon-Controlled Rectifier (SCR) is also called thyristor. In integrated circuit CMOS technology, thyristors are often used in electrostatic protection circuits to prevent electrostatic damage (ESD). Usually, the anode and cathode of the thyristor are connected to the electrostatic protection circuit. Under normal operating conditions, the potential difference between the two poles of the thyristor does not exceed its trigger Voltage, the thyristor does not conduct, and when the ESD electrostatic pulse is generated, because the ESD electrostatic pulse has the characteristics of large voltage and high energy, it is easy to trigger the thyristor to conduct, and then release it through the thyristor to achieve the purpose of electrostatic protection. [0003] At present, using SCR as an ESD protec...

Claims

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Application Information

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IPC IPC(8): H01L29/74
Inventor 单毅姜玉溪尚斌
Owner 单毅