Patent ID: 6847551

Claim:
Apparatus for using feedback to set a floating gate to a desired voltage during a set mode, said apparatus comprising: a) a floating gate for storing charge thereon; b) a first tunnel device formed between said floating gate and a first tunnel electrode, said first tunnel electrode biased by a first voltage; c) a second tunnel device formed between said floating gate and a second tunnel electrode, said second tunnel electrode biased by a second voltage, wherein the voltage differential between said first and second voltages for causing said first and second tunnel devices to operate in dual conduction during said set mode; d) a first circuit coupled to said floating gate, said first circuit comprising a differential stage for comparing the voltage on said floating gate to a third voltage, and a gain stage for generating an output voltage at an output terminal that is a function of the difference between the voltage on said floating gate and said third voltage; and e) a feedback circuit coupled between said output terminal and said floating gate comprising said first tunnel device and a third tunnel device, said feedback circuit for causing the voltage on said floating gate to be modified as a function said output voltage until said floating gate voltage, said third voltage and said output voltage are approximately equal.