Patent ID: 6262466
Filing Date: 2001-07-17
Classification: H01L

Abstract:
A lateral semiconductor structure having a punch-through diode forming a temperature-compensated voltage limitation, comprising:a first p-doped region;a first n-doped region, the first p-doped region being diffused into the first n-doped region;a second p-doped region arranged as a first ring around the first p-doped region and being insulated from the first p-doped region, a doping of the second p-doped region being greater than a doping of the first p-doped region; anda second n-doped region arranged as a second ring around the second p-doped region, the first and second rings being concentric, the doping of the second n-doped region being greater than the doping of the first n-doped region, the second p-doped region floating relative to the second n-doped region; whereinthe first p-doped region, the second floating p-doped region and the first n-doped region form the punch-through diode,the second p-doped region and the first n-doped region define a first p-n junction, andthe first n-doped region and the first p-doped region defining a second p-n junction, the punch-through diode having a breakdown voltage determined as a function of a punch-through effect of the second p-n junction and an avalanche effect of the first p-n junction.