Oscillators – Ring oscillators
Reexamination Certificate
2007-07-10
2007-07-10
Shingleton, Michael B. (Department: 2817)
Oscillators
Ring oscillators
C331S074000, C324S765010, C713S503000
Reexamination Certificate
active
10840850
ABSTRACT:
The present invention relates to test systems for testing integrated circuit devices and to calibration associated systems and methods. One embodiment of the invention provides an auto-calibration system. The system includes: a plurality of delay line elements (DLEs) adapted to be connected in a loop; a state machine coupled to the plurality of DLEs and operative to provide state data for the plurality of DLEs; a start oscillation signal receiving circuit coupled to the loop and operative to trigger the loop in response to receipt of a start oscillation signal; and a calibration circuit coupled to the loop and operative to acquire calibration data for the plurality of DLEs.
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Credence Systems Corporation
Shingleton Michael B.
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