Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode
Reexamination Certificate
2007-01-12
2009-02-03
Pert, Evan (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Having insulated electrode
C257SE29024
Reexamination Certificate
active
07485930
ABSTRACT:
The invention describes a structure and a process for providing ESD semiconductor protection with reduced input capacitance. The structure consists of heavily doped P+ guard rings surrounding the I/O ESD protection device and the Vcc to Bss protection device. In addition, there is a heavily doped N+ guard ring surrounding the I/O protection device its P+ guard ring. The guard rings enhance structure diode elements providing enhanced ESD energy discharge path capability enabling the elimination of a specific conventional Vss to I/O pad ESD protection device. This reduces the capacitance seen by the I/O circuit while still providing adequate ESD protection for the active circuit devices.
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Chen Shui-Hunyi
Lee Jian-Hsing
Pert Evan
Quinto Kevin
Taiwan Semiconductor Manufacturing Co. Ltd.
Thomas Kayden Horstemeyer & Risley
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