Protection circuit for semiconductor device and...

Details Protection circuit for semiconductor device and... Protection circuit for semiconductor device and...

Filed on

2007-07-17

Date issued

2008-03-18

Examiner

Nguyen, Vinh P. (Department: 2829)

Patent Class

Electricity: measuring and testing

SubClass

Fault detecting in electric circuits and of electric components

SubSubClass

Of individual circuit component or element

Other Related Categories

C324S1540PB

Type

Reexamination Certificate

Status

active

Patent number

07345497

Description

ABSTRACT:
A protection circuit comprises: at least one shielded line arranged to cover an area to be protected over a semiconductor device, the at least one shielded line having only one route from a start point to an end point; a signal generator for applying a signal to the start point of the shielded line; a counter which starts measurement of time in response to application of the signal to the start point of the shielded line by the signal generator and which ends measurement of the time in response to arrival of the signal at the end point of the shielded line; and a comparator for comparing the time measured by the counter with a reference value to output a fraud detection signal according to a result of the comparison.

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