Power supply clamping circuit for prolonging electrostatic discharge time

Abstract

The invention discloses a power supply clamping circuit for prolonging electrostatic discharge time. The power supply clamping circuit comprises a first RC time delay circuit module, a second RC time delay circuit module, an inverting circuit module and a discharge field effect tube, wherein the first RC time delay circuit module and the second RC time delay circuit module are connected with a source of the discharge field effect tube respectively, and are connected with a drain of the discharge field effect tube respectively; the second RC time delay circuit module is connected with a grid of the discharge field effect tube; the first RC time delay circuit module is connected with the second RC time delay circuit module through the inverting circuit module; the first RC time delay circuit module is used for conducting the discharge field effect tube for carrying out electrostatic discharge; when discharge time reaches a delay time coefficient of the first RC time delay circuit module, the second RC time delay circuit module is started to carry out electrostatic discharge on the discharge field effect tube; and when the discharge time reaches the delay time coefficient of the second RC time delay circuit module, the second RC time delay circuit module cuts off the discharge field effect tube.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a power clamp circuit for prolonging electrostatic discharge time, in particular to a power clamp circuit for prolonging ESD (Electrostatic Discharge) time in the field of microelectronics technology. Background technique [0002] Static electricity can be said to be ubiquitous. Any two objects of different materials rubbing against each other may generate static electricity. When electronic components are manufactured, produced, assembled, tested, stored, and transported, static electricity will accumulate in the human body, instruments, storage equipment, etc., and even charge will accumulate in the electronic components themselves. When the electrostatic source is in contact with other objects, there is a flow of charges, which will generate potentially destructive voltages, currents, and electromagnetic fields, which can destroy the objects in severe cases. This is electrost...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a power supply clamp circuit that prolongs the electrostatic discharge time in view of the deficiencies in the prior art, so as to overcome the short static discharge time of the power supply clamp circuit in the prior art, which leads to poor electrostatic protection ability of the chip Defects, and after the electrostatic discharge is completed, the discharge tube cannot return to the off state, resulting in the defect that the power supply clamp circuit cannot work normally

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