US 2012/0257308 A1Published application

Surge Protection Circuit

OwnerHsin-Hsien Li, Yu-Lin Chu +1inventors

InventorsHsin-Hsien Li, Yu-Lin Chu, Li-Yu Chiu

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Abstract

The present invention discloses a surge protection circuit for a line driver. The surge protection circuit includes a transistor, including a first terminal coupled to a positive output pad of the line driver and a second terminal coupled to a negative output pad of the line driver, an inverter, including an output terminal coupled to a third terminal of the transistor, and a first RC circuit, including a resistor having a terminal coupled to an input terminal of the inverter and another terminal coupled to a power supply, and a capacitor having a terminal coupled to the input terminal of the inverter and another terminal coupled to a ground. A first RC time constant of the first RC circuit is substantially equal to or greater than a period of a differential mode surge signal.

Claims5

Dependent claims

A surge protection circuit for a line driver of a communication system, comprising:

a transistor, comprising a first terminal, a second terminal and a third terminal, and the first terminal coupled to a positive output pad of the line driver, the second terminal coupled to a negative output pad of the line driver;
an inverter, comprising an input terminal and an output terminal, the output terminal coupled to the third terminal of the transistor;
and
a first RC delay circuit, comprising:
a resistor having a terminal coupled to an input terminal of the inverter, and another terminal coupled to a power supply;
and
a capacitor having a terminal coupled to the input terminal of the inverter and another terminal coupled to a ground,
wherein a first RC time constant of the first RC circuit is substantially greater than or equal to a period of a differential mode surge signal.

5 more elements

Dependencies are inferred from the claim text.