The invention is related to methods and apparatus for providing a two-terminal
constant current device, and its operation thereof. The invention provides a constant
current device that maintains a constant current over an applied voltage range
of at least approximately 700 mV. The invention also provides a method of changing
and resetting the constant current value in a constant current device by either
applying a positive potential to decrease the constant current value, or by applying
a voltage more negative than the existing constant current's voltage upper limit,
thereby resetting or increasing its constant current level to its original fabricated
value. The invention further provides a method of forming and converting a memory
device into a constant current device. The invention also provides a method for
using a constant current device as an analog memory device.
