Circuit and method for reading a resistive switching device in an array
AssigneeHewlett-Packard Development Company, L.P.
InventorFrederick Perner
Life of this patent
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Abstract
A read circuit for sensing a resistive state of a resistive switching device in a crosspoint array has an equipotential preamplifier connected to a selected column line of the resistive switching device in the array to deliver a read current while maintaining the selected column line at a reference voltage near a biasing voltage applied to unselected row lines of the array. The read circuit includes a reference voltage generation component for generating the reference voltage for the equipotential preamplifier. The reference voltage generation component samples the biasing voltage via the selected column line and adds a small increment to a sampled biasing voltage to form the reference voltage.
Claims20
A read circuit for sensing a resistive state of a resistive switching device in a crosspoint array, comprising:
- an equipotential preamplifier for connecting to a selected column line of the resistive switching device in the array to deliver a read current while maintaining the selected column line at a reference voltage matched to a biasing voltage applied to unselected row lines of the array;
- and
- a reference voltage generation component for generating the reference voltage for the equipotential preamplifier, the reference voltage generation component being connected to sample the biasing voltage via the selected column line and add to a sampled biasing voltage to form the reference voltage.
A method of reading a resistive state of a resistive switching device in a crosspoint array, comprising:
- connecting an equipotential preamplifier to a selected column line of the resistive switching device in the array;
- applying a biasing voltage to unselected row lines of the array;
- sampling the biasing voltage via the selected column line;
- adding to a sampled biasing voltage to generate a reference voltage;
- operating the equipotential preamplifier to deliver a read current through the selected column line while maintaining the selected column line at the reference voltage;
- and
- determining the resistive state of the resistive switching device based on the read current.
A read circuit for sensing a resistive state of a resistive switching device in a crosspoint array, comprising:
- an equipotential preamplifier for connecting to a selected column line of the resistive switching device in the array to deliver a read current while the selected column line is maintained at a reference voltage that is matched to a biasing voltage applied to unselected row lines of the array during a reading operation;
- and
- a reference voltage circuit for adding voltage to a sampled value of the biasing voltage and outputting that voltage that is higher than the biasing voltage to the equipotential preamplifier as a reference voltage.
A read circuit as in claim16, wherein an output of the equipotential preamplifier is applied to a gate of a pass transistor, with a drain of the pass transistor being connected to the selected column.
Dependencies are inferred from the claim text.