Patent ID: 6414536
Filing Date: 2002-07-02
Classification: G05F

Abstract:
A voltage reference circuit, comprising:a first differential pair transistor; a second differential pair transistor coupled to the first differential pair transistor; wherein the first differential pair transistor and the second differential pair transistor have matching geometrical and electrical characteristics; a first adjusting transistor having a gate coupled to a gate of the first differential pair transistor; a second adjusting transistor having a gate coupled to a gate of the second differential pair transistor; wherein the first adjusting transistor and the second adjusting transistor have matching geometrical and electrical characteristics; and a feedback loop coupled to the first differential transistor, the second differential transistor, the first adjusting transistor and the second adjusting transistor for producing a reference voltage; wherein the reference voltage is adjusted by transferring of charges between the first differential pair transistor and the first adjusting transistor via the gate of the first differential pair transistor being coupled to the gate of the first adjusting transistor and the transferring of charges between the second differential pair transistor and the second adjusting transistor via the gate of the second differential pair transistor being coupled to the gate of the second adjusting transistor.