Static information storage and retrieval – Systems using particular element – Resistive
Reexamination Certificate
2011-04-05
2011-04-05
Elms, Richard (Department: 2824)
Static information storage and retrieval
Systems using particular element
Resistive
C365S189070, C365S189160
Reexamination Certificate
active
07920407
ABSTRACT:
Circuitry for performing a set or reset process for a reversible resistance-switching memory element in a memory device. A ramped voltage is applied to the memory cell and its state is constantly monitored so that the voltage can be discharged as soon as the set or reset process is completed, avoiding possible disturbs to the memory cell. One set circuit ramps the voltage using a current source, while detecting a current peak using an op-amp loop. One reset circuit ramps the voltage using an op-amp loop, while detecting a current peak by continuing to draw current at the peak current to maintain the output signal stable. Another set circuit ramps the voltage using an op-amp loop and a source-follower configuration. Another reset circuit ramps the voltage using an op-amp loop and a source-follower configuration with level shifting to reduce power consumption. Faster detection and shutoff, and stable operation, are achieved.
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Cazzaniga Marco
Chen Ying-chang
Elms Richard
Nguyen Hien N
SanDisk 3D LLC
Vierra Magen Marcus & DeNiro LLP
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