Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-03-06
2008-08-05
Ramos-Feliciano, Eliseo (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S074000, C702S183000, C702S188000
Reexamination Certificate
active
07409305
ABSTRACT:
A methor for storage cell read timing evaluation provides read strength information by using a pulsed ring oscillator. A pulse generator is coupled to a bitline to which the storage cell to be measured is connected. The storage cell thereby forms part of the ring oscillator and the read strength of the storage cell is reflected in the frequency of oscillation. A pulse regeneration circuit is included in the ring so that the storage cell read loading does not cause the oscillation to decay. Alternatively, a counter may be used to count the number of oscillations until the oscillations decay, which also yields a measure of the read strength of the storage cell. The pulse generator may have variable output current, and the current varied to determine a change in current with the storage cell enabled and disabled that produces the same oscillation frequency. The read current is the difference between currents.
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Carpenter Gary D.
Kuang Jente B
Nowka Kevin J.
Pang Liang-Teck
Harris Andrew M.
International Business Machines - Corporation
Mitch Harris Atty at Law, LLC
Ramos-Feliciano Eliseo
Salys Casimer K.
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