Patent ID: 6130812
Filing Date: 2000-10-10
Classification: H03K

Abstract:
A protection circuit comprising:a first diode, having a cathode and an anode, connected in series with a first wire, a first output terminal of a driver, and a first input terminal of a receiver;a second diode, having a cathode and an anode, connected in series with a second wire, a second output terminal of the driver, and a second input terminal of the receiver;a first resistor; anda second resistor,wherein said cathode of said first diode is electrically coupled to said first output terminal of the driver and said anode of said first diode is electrically coupled to said first input terminal of the receiver and to a first resistor,wherein said cathode of said second diode is electrically coupled to said second output terminal of the driver and said anode of said second diode is electrically coupled to said second input terminal of the receiver and to a second resistor, andwherein said first and second resistors are connected to a power supply in order to always forward bias the first and second diodes when the power supply is supplying power, such that said protection circuit blocks substantially all DC current flow from said driver to said receiver.