Patent ID: 8872223
Filing Date: 2014-10-28
Classification: H01L

Abstract:
1. A circuit formed on a substrate, comprising: a first terminal; a second terminal; a first lightly doped region having a first conductivity type formed on a second lightly doped region having a second conductivity type; a first heavily doped region having the second conductivity type formed within the first lightly doped region at a face of the substrate and coupled to the first terminal; a second heavily doped region having the first conductivity type formed within the second lightly doped region at the face of the substrate and coupled to the second terminal; a third heavily doped region having the second conductivity type formed at least partially within the first lightly doped region at the face of the substrate between the first and second heavily doped regions and electrically connected to the second lightly doped region, wherein a space between the first and third heavily doped regions determines a switching voltage of the circuit; and a transistor having a current path coupled between the third heavily doped region and the second terminal and having a control terminal coupled to receive a control voltage, wherein the transistor is on in response to a first value of the control voltage, and wherein the transistor is off in response to a second value of the control voltage.