ESD protecting circuit and electronic device

Abstract

The invention discloses an ESD protecting circuit and an electronic device. When positive static electricity exists between a power supply end and a grounding end of a power supply, current of the positive static electricity flows to the grounding end via a first forward low-voltage diode and a high-voltage diode; when negative static electricity exists between the power supply end and the grounding end of the power supply, current of the negative static electricity flows to the power supply end via a high-voltage diode and a second reverse low-voltage diode; because the parasitic capacitanceof a bidirectional conduction module is smaller than the parasitic capacitance formed by the high-voltage diode, and is serially connected with the parasitic capacitance formed by the high-voltage diode, and therefore, the total parasitic capacitance of the ESD protecting circuit is small to increase the bandwidth of the ESD protecting circuit; and meanwhile, owing to the high-voltage diode whichresists high voltage, the high voltage resistance of the ESD protecting circuit is excellent.

Description

technical field [0001] The invention relates to the technical field of electrostatic protection, and more specifically, relates to an ESD protection circuit and an electronic device. Background technique [0002] An ESD (Electro-Static discharge, electrostatic discharge) circuit is an extremely important part of a semiconductor integrated circuit. It is mainly responsible for protecting the devices inside the chip from ESD damage. With the gradual complexity of application scenarios and the continuous improvement of people's requirements for ESD performance, for example, in the application scenarios of high-voltage and high-speed analog switches that require high-voltage short-circuit protection, USB (Universal Serial Bus, Universal Serial Bus) with overvoltage protection Bus) switch as an example, on the one hand, it allows the external port to be directly short-circuited to high voltage, such as 20V, on the other hand, it requires the parasitic capacitance on the entire p...

AI Technical Summary

Problems solved by technology

However, in some existing high-voltage ESD protection circuit solutions, there is a large parasitic capacitance between the protected port and the ground terminal of the power supply, which will affect the signal integrity of the high-speed port and cannot meet the application scenarios of high-speed signal transmission.

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