Electrostatic discharge protection circuit and method thereof
A technology of electrostatic discharge protection and discharge circuit, which is applied in the direction of emergency protection circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, circuit device, etc., and can solve problems affecting the normal operation of integrated device 20, etc.
Active Publication Date: 2012-07-04
MEDIATEK INC
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Problems solved by technology
According to prior art, endpoint N 1 The increased voltage at will affect the normal operation of the integrated device 20
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[0014] Certain terms are used in the specification and patent claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and the patent application claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned throughout the specification and the patent application claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" here includes any direct and indirect electrical connection means. Therefore, if it is described in the text that the first device is coupled to the second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection ...
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The invention discloses an electrostatic discharge protection circuit and an electrostatic protection method. The circuit includes a transient detecting circuit, a level adjusting circuit, a discharging circuit, and a sustaining circuit. The transient detecting circuit is coupled to a first pad for detecting an input signal at the first pad to generate a transient signal; the level adjusting circuit is coupled to the transient detecting circuit for adjusting an output voltage at an output terminal of the level adjusting circuit; the discharging circuit is coupled to the first pad and the output terminal of the level adjusting circuit for discharging the input signal of the first pad to a second pad when enabled by the output voltage; and the sustaining circuit is coupled between the level adjusting circuit and the transient detecting circuit, for selectively controlling the level adjusting circuit to sustain an enablement of the discharging circuit according to the transient signal, wherein the sustaining circuit is a first transistor, and the control terminal of the first transistor is directly coupled with the output endpoint of the level adjusting circuit. By utilizing the invention, electrostatic signal can be fully discharged, and the normal operation of the integrated device can not be affected.
Description
technical field [0001] The present invention relates to electrostatic discharge (ESD) protection circuits, and more particularly, to ESD protection circuits and methods thereof that allow sufficient time to discharge electrostatic signals. Background technique [0002] refer to figure 1 , figure 1 It is a schematic diagram of an ESD protection circuit 10 in the prior art, and the ESD protection circuit 10 is used to protect the integrated device 20 from being damaged by electrostatic signals. Electrostatic discharge protection circuit 10 comprises low-pass filter 11, inverter (inverter) 12 and discharge circuit 13, wherein low-pass filter 11 comprises resistor R and capacitor C, and inverter 12 comprises PMOS transistor Mpa and NMOS transistor Mna , the discharge circuit 13 includes an NMOS transistor Mnb. The connection between the low-pass filter 11, the inverter 12 and the discharge circuit 13 is as figure 1 shown. And the first pad 14 is coupled to the first termina...
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IPC IPC(8): H02H9/04
CPCH02H9/046H02H3/006
Inventor 林奕成郑道
Owner MEDIATEK INC