High-trigger current SCR

摘要

An SCR includes a first doped region of a first type having a first doping concentration. A first well of the first type and a first well of a second type are disposed in upper areas of the first doped region of the first type such that the first well of the second type is laterally spaced from the first well of the first type by a non-zero distance. A second doped region of the first type has a second doping concentration that is greater than the first doping concentration and is disposed in the first well of the second type to form an anode of the SCR. A first doped region of the second type is disposed in the first well of the first type and forms a cathode of the SCR.

主权项

1. A silicon-controlled rectifier, comprising:
a first doped region of a first type disposed over a semiconductor substrate, the first doped region having a first doping concentration; a first well of the first type disposed in a first upper area of the first doped region of the first type such that the first well of the first type does not extend to a bottom of the first doped region of the first type; a first well of a second type disposed in a second upper area of the first doped region of the first type such that the first well of the second type does not extend to the bottom of the first doped region of the first type, the first well of the second type laterally spaced apart from the first well of the first type by a non-zero distance; a second doped region of the first type disposed in a first upper area of the first well of the second type, the second doped region of the first type forming an anode of the silicon-controlled rectifier and having a second doping concentration that is greater than the first doping concentration; and a first doped region of the second type disposed in a first upper area of the first well of the first type, the first doped region of the second type forming a cathode of the silicon-controlled rectifier.