Texas Instruments Corporation

Steven P Korson

Clive D Bittlestone

Bryan David Sheffield

Brian D Borchers

Doug Counce

An embodiment of the invention is a method for measuring access time where the frequency of a ring oscillator is measured with and without a device under testin the ring. Those two frequencies are compared to calculate the access time of the device under test. Another embodiment of the invention is circuitrythat measures the frequency of a ring oscillator with and without a device under test. Again the two frequencies are compared to calculate the access time of the device under test

Oscillation based access time measurement

An embodiment of the invention is circuitry that contains a programmable delay and a pulse generator that send clock signals of a certain frequency to a device under test . The programmable delay increases the frequency of the clock signal to the device under test until the device under test fails. The cycle time measurement of the device under test is the period of maximum frequency at which the device under test operates properly.

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Bruckberg, Germany

Steven P Korson