Patent ID: 6674621
Filing Date: 2004-01-06
Classification: H01L,H02H

Abstract:
A reverse bias protection structure, comprising:a P-type substrate; an N-type well residing within the P-type substrate; a PMOS transistor structure residing within the N-type well, having a drain portion, a gate portion, a source portion and a backgate portion, wherein the gate portion is coupled to a first voltage potential, the source portion is selectively coupleable to a power supply, and the drain portion is selectively coupleable to a circuit needing power to be supplied thereto from the power supply, and wherein the N-type well comprises the backgate portion thereof; and a Schottky diode structure comprising a metal contact formed on a portion of the N-type well and forming a Schottky contact via a metal/semiconductor interface, the Schottky diode structure having an anode coupled to the source portion of the PMOS transistor structure, and a cathode coupled to the backgate portion of the PMOS structure, wherein the Schottky contact comprises a rectifying contact, thereby rendering the Schottky contact a Schottky barrier diode, wherein a reverse bias voltage in which a potential of the N-type well exceeds a potential of the metal contact results in a negligible current flow from the N-type well to the metal contact.