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Precision programming of nonvolatile memory cells

  • US 6,285,598 B1
  • Filed: 03/13/2000
  • Issued: 09/04/2001
  • Est. Priority Date: 03/06/1997
  • Status: Expired due to Term
First Claim
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1. An integrated circuit memory system comprising:

  • a control block controlling operations of said integrated circuit memory system;

    a plurality of memory cells, each memory cell comprising;

    a source, drain, control gate and floating gate, said floating gate capable of storing electric charge, said memory cells programmable by hot carrier injection of electric charge to said floating gate corresponding to input signals to said integrated circuit memory system;

    circuit means, responsive to said control block, for applying a first set of preselected voltages to a source, drain and control gate of a selected memory cell in a first set of timed relationships and for controlling a programming current independently of said input signals, said programming current flowing between said source and drain during programming of said selected memory cell so that an amount of electric charge stored on a floating gate of said selected memory cell is precisely controlled.

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