Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-03-14
2006-03-14
Lieu, Julie Bichngoc (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S636100, C340S636210, C340S660000, C340S661000, C340S657000, C340S514000
Reexamination Certificate
active
07012537
ABSTRACT:
A beacon circuit enabling study of active elements in an integrated circuit is disclosed. The beacon circuit may be integral to a DUT to be tested. The DUT is stimulated by a conventional ATE, so that its active devices are operating. The signal from the active device is sent to the beacon circuit which, in response to the signal, emits light having intensity that is proportional to the value of the signal. In one example, the beacon circuit is constructed as a voltage to current converter having its input connected to the node of interest and its output connected to a current to light converter. In one example, the current to light converter is implemented as a current mirror circuit. One beneficial implementation disclosed is the use of the beacon circuit for the study of voltage supply disturbances.
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Kasapi Steven
Woods Gary Leonard
Bach, Esq. Joseph
Credence Systems Corporation
Lieu Julie Bichngoc
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