Patent ID: 8054687

Claim:
A voltage reference device comprising: a first floating-gate transistor including a first source, a first drain, and a first gate, wherein the first gate is coupled to a first programming capacitor and a first input capacitor; a second floating-gate transistor including a second source, a second drain, and a second gate, wherein the second gate is coupled to a second programming capacitor and a second input capacitor; wherein a charge difference between the first floating-gate transistor and the second floating-gate transistor is a reference voltage; and wherein the first drain and the first gate of the first floating-gate transistor and the second drain and the second gate of the second floating-gate transistor are enabled to be connected to a functional circuit for run-mode operation; wherein the first drain and the first gate of the first floating-gate transistor and the second drain and the second gate of the second floating-gate transistor are enabled to be isolated from the functional circuit and connected to a programming circuit for programming.