| 摘要 |
A method and circuit for programming a floating gate in a differential floating gate circuit to an input set voltage. The circuit includes a differential amplifier circuit for comparing the voltage on a floating gate with an input set voltage, and a gain stage for amplifying any voltage differential between those two voltages. During a set mode, an erase and a program tunnel device operate in a dual conduction mode for modifying the voltage on the floating gate. The output at the gain stage is used to modify the voltage across the erase tunnel device via a feedback loop until the differential floating gate circuit settles to a steady state condition such that the floating gate voltage is approximately equal to the input set voltage. Thereafter, during a read mode, the differential floating gate circuit may be reconfigured to preferably function as a voltage comparator with a built-in voltage reference.
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