Electrostatic protection circuit of CLAMP type

Abstract

The invention belongs to the technical field of the electrostatic protection circuit, and specifically relates to an electrostatic protection circuit of the CLAMP type. A leakage circuit containing aNMOS tube is arranged in an electrostatic protection circuit; the leakage circuit leaks the electrostatic voltage by using snapback conducting of the NMOS tube; the working voltage of the NMOS tube islower than the electrostatic voltage, and the electrostatic protection circuit can simulate the running through simulation software, improves the success rate of the first current sheet, the financing cost and the time cost are saved.

Description

technical field [0001] The invention belongs to the technical field of static electricity protection circuits, and in particular relates to a CLAMP type static electricity protection circuit. Background technique [0002] The development of integrated circuits has made the technology more and more advanced, and the size of MOS devices has become smaller and smaller. In order to obtain a smaller chip area, people always tend to use more advanced technology to realize chip design. However, as the size of MOS devices becomes smaller and smaller, the operating voltage of MOS devices is also lower and lower. For example, the 0.13um process can provide devices with a maximum voltage of 5V. In the 55nm and 40nm processes, only devices with a maximum voltage of 3.3V can be provided. Even in the 28nm process, only devices with a maximum voltage of 1.8V can be provided. [0003] Unfortunately, the voltage requirements of our application are fixed and will not be lowered due to the d...

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Problems solved by technology

[0013] Aiming at the shortcomings that current CLAMP-type electrostatic protection circuits cannot discharge high electrostatic voltage through low-voltage devices and that GGNMOS-type electrostatic protection circuits cannot simulate and run, the purpose of this invention is to design a circuit that can pass low-voltage operation High-voltage devices complete the discharge of high electrostatic voltage, and can simulate the operation through simulation software to improve the success rate of the first tape-out

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