Realtek Semiconductor Inc.

Chung-yu Huang

The present disclosure discloses an electrical discharge circuit. A voltage-dividing circuit performs voltage division on a voltage input terminal. A detection circuit generates a boosted detection signal. A first inverter is coupled to a first voltage feeding terminal and a second inverter input terminal. A second inverter is coupled to a first inverter output terminal and a ground terminal. A capacitor circuit of a RC circuit is coupled to the first voltage feeding terminal through a resistor to be charged to provide electric charges to the inverter input terminals. A first switch circuit is coupled to one of the inverter input terminals and the ground terminal. The boosted detection signal turns on and off the first and the second switch circuits respectively when an ESD input occurs such that a first and a second discharge transistors controlled by the inverter output terminals turn on to discharge the voltage input terminal.

Electrical discharge circuit

The present invention discloses an electrical discharge circuit having stable discharging mechanism is provided. A voltage division circuit generates a detection signal based on a voltage input terminal such that a first inverter outputs an inverted detection signal. First PMOS and NMOS circuits are coupled in series between a voltage input terminal and a ground terminal through a first terminal. Second PMOS and NMOS circuits are coupled in series between the voltage input terminal and the ground terminal through a second terminal. A first and a second PMOS control terminals are coupled to the second terminal and the first terminal respectively. A first and a second NMOS control terminals receive the inverted detection signal and the detection signal respectively. A second inverter receives an inverted boost detection signal from the second terminal and outputs a boost detection signal. AN ESD transistor is turned off due to the boost detection signal to discharge the voltage input terminal.

Electrical discharge circuit having stable discharging mechanism

The present invention discloses an electrical discharge circuit having stable discharging mechanism. A voltage-dividing circuit generates a detection signal such that a first inverter outputs an inverted detection signal. A first PMOS and a first NMOS are coupled through a first terminal between the voltage input terminal and a ground terminal. A second NMOS is coupled between a second terminal and the ground terminal. A first PMOS control terminal is coupled to the second terminal. A first and a second NMOS control terminals respectively receive the inverted detection signal and the detection signal. A resistor and a capacitor are coupled through the control terminal coupled to the second terminal and between the voltage input terminal and the ground terminal. A second inverter receives an inverted boosted detection signal from the control terminal to output a boosted detection signal to control an electrostatic discharge MOS to discharge the voltage input terminal.

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Hsinchu, Taiwan

Chung-yu Huang