ESD protection circuit with anti-reverse-connection circuit and implementation method of ESD protection circuit

Abstract

The invention provides an ESD protection circuit with an anti-reverse-connection circuit and an implementation method of the ESD protection circuit. The ESD protection circuit with the anti-reverse-connection circuit comprises an ESD protection circuit body and the anti-reverse-connection circuit; the ESD protection circuit body is connected between an input end of a power supply and an internal circuit and used for conducting ESD protection on the internal circuit; the anti-reverse-connection circuit is connected between the input end of the power supply and the ESD protection circuit body; when forward power supply voltage is connected to the input end of the power supply, the anti-reverse-connection circuit is switched on, and the input end of the power supply is connected with the internal circuit; when reverse power supply voltage is connected to the input end of the power supply, the anti-reverse-connection circuit is switched off, and the input end of the power supply is disconnected with the internal circuit to achieve anti-reverse-connection protection. By means of the ESD protection circuit, the problems are solved that in an existing ESD protection circuit, when the reverse power supply voltage is connected to the input end of the power supply, a parasitic diode of an NMOS transistor is switched on, large current is generated accordingly, and therefore a whole circuit system works abnormally or is even burnt.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to an ESD protection circuit with an anti-reverse connection circuit and a realization method thereof. Background technique [0002] Electrostatic Discharge (ESD) protection is very important for integrated circuits, and many studies have been conducted in the field of integrated circuit design. Electrostatic discharge may occur no matter in the normal use, transportation and storage of electronic equipment, or in the process of producing and assembling various integrated circuit components. These electrostatic discharges, which are difficult to predict and prevent correctly, will damage integrated circuits, generate defective rates, and even cause serious losses. Special attention will be paid to the design of ESD protection circuits in the current design and manufacture of integrated circuits. [0003] In the existing chip design, an ESD protection circuit is generally provided bet...

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an ESD protection circuit with an anti-reverse connection circuit and its implementation method, which is used to solve the problem in the existing ESD protection circuit when the power supply input terminal is connected to the reverse direction. When the power supply voltage is high, the parasitic diode of the NMOS tube itself is turned on, thereby generating a large current, which causes the problem that the entire circuit system does not work properly or even burns out.

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