Patent ID: 7515391
Filing Date: 2009-04-07
Classification: H04M

Abstract:
1. A low capacitance overvoltage protection circuit, comprising: an overvoltage protection device having at least two terminals, said overvoltage protection device responsive to an overvoltage for providing a low impedance path between said two terminals; said overvoltage protection device characterized by a rated surge current; a diode bridge having at least four nodes, and said diode bridge having a first diode connected between a first node and a third node, a second diode connected between the third node and a second node, a third diode connected between the second node and a fourth node, a fourth diode connected between the first node and the fourth, and said overvoltage protection device connected between said first and second nodes of said diode bridge; one or more of said diodes having a respective junction area capable of carrying the rated surge current of said overvoltage protection device and not substantially more, thereby minimizing a capacitance of said diode bridge; and said diode bridge does not include series bridge diodes to reduce capacitance, between at least one of the following four pairs of nodes;