Patent ID: 7759759

Claim:
An integrated circuit comprising: a high voltage (HV) Schottky barrier diode formed in a first region in a semiconductor layer of a first conductivity type, the first region comprising an epitaxial layer of the first conductivity type acting as a cathode of the HV Schottky barrier diode, the HV Schottky barrier diode comprising: a metal layer acting as an anode of the HV Schottky barrier diode; and a first well of a second conductivity type, the first well forming a guard ring surrounding an anode edge of the HV Schottky barrier diode; and a low voltage device formed in a second region in the semiconductor layer, the low voltage device being formed in a second well of the second conductivity type in the semiconductor layer, wherein the second well is more heavily doped than the first well, the doping level of the first well being selected to provide a breakdown voltage for the HV Schottky barrier diode that is higher than a breakdown voltage of the low voltage device; and wherein the HV Schottky barrier diode is isolated in the first region by using an iso region of the second conductivity type.