Programming pulse ramp control circuit
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United States of America Patent
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Nov 11, 1997
Grant Date -
N/A
app pub date -
Oct 9, 1996
filing date -
Oct 9, 1996
priority date (Note) -
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Abstract
A pulse ramp control circuit allows for the program voltage applied to the control gate of a memory cell to be ramped from a low voltage to a high voltage in a precise manner. The ramp rate of this program voltage is primarily determined by a single capacitor and the bias current provided thereto. By providing a ramped program voltage to the memory array during programming operations, present embodiments effectively cover the entire distribution of program voltage v. program current for the memory cells to be programmed, thereby minimizing over-program and under-program conditions without reducing program time.
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