Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Reexamination Certificate
2011-03-22
2011-03-22
Leja, Ronald W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
Reexamination Certificate
active
07911752
ABSTRACT:
An electrostatic discharge (ESD) protection circuit is electrically connected to a core circuit for preventing ESD charges from reaching the core circuit. The ESD protection circuit includes a pad, a pass transistor, a transistor, a capacitor, a resistor, and a delay trigger unit. The pass transistor controls passage of charges from the pad to the core circuit. The transistor sinks ESD charges during an ESD zapping event. The capacitor and the resistor couple voltage at the pad to a control electrode of the transistor for turning on the transistor during the ESD zapping event. The delay trigger unit retards transmission of low voltage to a control electrode of the pass transistor for keeping the pass transistor turned off during the ESD zapping event.
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Chang Kun-Wei
Hsu Mao-Shu
Huang Shao-Chang
Lee Tang-Lung
Lin Wei-Yao
e-Memory Technology, Inc.
Hsu Winston
Leja Ronald W
Margo Scott
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