Fluid ejection device and method
AssigneeHewlett-Packard Development Company, L.P.
InventorsStan E. Leigh, Kevin Bruce, Joseph M. Torgerson, Trudy Benjamin
Life of this patent
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Abstract
A fluid ejection device includes one or more digital data storage arrays having plural EPROM cells. A method for affirming performance adequacy of EPROM cells in the one or more arrays includes the steps of identifying a reference cell in each array, measuring a selected performance criterion for the reference cells, obtaining a reference criterion value, and evaluating the actual performance of at least one cell in each array with respect to the reference criterion value.
Claims20
An integrated die for a fluid ejection device, comprising:
- (a) a semiconductor substrate;
- (b) a fluid firing array embodied in the substrate;
- and
- (c) first and second digital data storage arrays, having plural EPROM cells, the first and second storage arrays being located on the substrate on respective opposite sides of the fluidfiring array, the EPROM cells in the first storage array as a group exhibiting first performance characteristics, and the EPROM cells in the second storage array as a group exhibiting second performance characteristics.
A method for affirming performance adequacy of EPROM cells on a single substrate, comprising:
- (a) identifying a first reference cell in a first EPROM array on the substrate;
- (b) measuring a selected performance criterion for the first reference cell to obtain a reference criterion value;
- and
- (c) evaluating against the reference criterion value the actual performance of at least one cell in the first array.
A method for manufacturing a die for a fluid ejection device, the method comprising the steps of:
- (a) embodying a fluid firing array in a semiconductor substrate;
- (b) manufacturing first and second digital data storage arrays in the substrate with the fluid firing array therebetween, each of the storage arrays being comprised of plural EPROM cells;
- (c) locating a first EPROM reference cell in the substrate in close proximity to the first storage array;
- and
- (d) locating a second EPROM reference cell in the substrate in close proximity to the second storage array.
Dependencies are inferred from the claim text.