Electrostatic discharge protection circuit
An electrostatic discharge protection and protection circuit technology, which is applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. question
Active Publication Date: 2018-10-09
REALTEK SEMICON CORP
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Problems solved by technology
Existing ESD protection circuits usually use diodes as part of the protection circuit, and the discharge must be discharged to the ground terminal through the path of the power supply terminal, because the use of diodes will increase the impedance of the circuit (such as the impedance of the input / output terminal), and through Generally speaking, the discharge path at the power supply end is long, which is not conducive to real-time discharge, so there is still room for improvement in the existing ESD protection circuit
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[0016] The terms used in the following explanations refer to the customary terms in the technical field. If some terms are explained or defined in this manual, the explanations of these terms shall be based on the descriptions or definitions in this manual.
[0017] The invention discloses an electrostatic discharge (Electrostatic Discharge, ESD) protection circuit, which can reduce the use of diodes to reduce the influence of the use of diodes on impedance, and can shorten the electrostatic discharge path to accelerate the discharge of abnormal energy. The present invention can be applied to various circuits such as Ethernet circuits and other circuits requiring ESD protection, and is applicable to circuits using differential signals, but the application of the present invention is not limited thereto.
[0018] see Figure 1a , which is a functional block diagram of an embodiment of the electrostatic discharge protection circuit of the present invention. like Figure 1a As sh...
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The invention discloses an electrostatic discharge protection circuit which comprises first and second ends, a detection circuit and a protection circuit. The first end provides a first voltage whosevalue is a first value in a normal mode; the second end provides a second voltage whose value is a second value in the normal mode; the detection circuit is coupled between the first and second ends and used to provide a detection voltage according to the first and second voltages; and the protection circuit is coupled with the detection circuit, between the first end and a grounding end, and between the second end and the grounding end, runs in the normal mode or an electrostatic discharge mode according to the detection voltage, and changes from the normal mode into the electrostatic discharge mode when the difference between the value of the detection voltage and the average value of the first and second values reaches a preset threshold, and thus, the protection circuit enables that afirst path between the first end and the grounding end is changed from an OFF state to an ON state and / or that a second path between the second end and the grounding end from the OFF state to the ON state.
Description
technical field [0001] The present invention relates to protection circuits, in particular to electrostatic discharge protection circuits. Background technique [0002] The existing electrostatic discharge (Electrostatic Discharge, ESD) protection circuit is to detect the power supply terminal (such as high voltage V DD terminal with a low voltage V SS terminal) or detect the voltage of the power supply terminal and the ground terminal to activate the protection mechanism. Existing ESD protection circuits usually use diodes as part of the protection circuit, and the discharge must be discharged to the ground terminal through the path of the power supply terminal, because the use of diodes will increase the impedance of the circuit (such as the impedance of the input / output terminal), and through Generally speaking, the discharge path at the power supply end is long, which is not conducive to real-time discharge, so there is still room for improvement in the existing ESD pr...
Claims
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IPC IPC(8): H02H9/04
CPCH02H9/041
Inventor 吴健铭
Owner REALTEK SEMICON CORP