Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2008-05-28
2009-11-17
Feliciano, Eliseo Ramos (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S074000, C702S182000, C702S183000
Reexamination Certificate
active
07620510
ABSTRACT:
A pulsed ring oscillator circuit for storage cell read timing evaluation provides read strength information. 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
Feliciano Eliseo Ramos
Handelsman Libby Z.
Harris Andrew M.
Harris, Atty at Law, LLC Mitch
International Business Machines - Corporation
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