Patent ID: 7372109
Filing Date: 2008-05-13
Classification: H01L

Abstract:
1. An apparatus, comprising: a semiconductor substrate of a first conductivity type; a buried layer of a second conductivity type formed in the semiconductor substrate; a well of the first conductivity type formed adjacent the buried layer; a connection region of the second conductivity type formed in the substrate and contacting the buried layer; two isolation regions, respectively formed in the substrate on two sides of the buried layer, at least one of said isolation regions extending further into the substrate than the buried layer, wherein the isolation regions together with the buried layer isolate the well and the connection region from the semiconductor substrate; a first doped region of the second conductivity type formed in the well and adapted to provide a first electrode of a diode; and an anode/cathode interface between the well and the first doped region, the anode/cathode interface extending into the substrate a distance less than the depth of the top of the isolation regions, wherein the connection region and the well are adapted to be electrically connected and to provide a second electrode of the diode.