King Owyang

Lateral HVIC with 1200-V bipolar and field-effect devices

The 1200-V blocking capability of lateral high-voltage devices has been achieved through theoretical and experimental investigation. The feasibility of a 1200-V lateral n-p-n bipolar junction transistor, p-n diode, and lateral DMOSFET has been demonstrated for the first time. The on-resistance of the 1200-V DMOSFET is 4 times less than its 1200-V n-p-n BJT counterpart. The major contribution to high BJT on-resistance comes from the series JFET pinch resistance.

Integrated circuit incorporating low voltage and high voltage semiconductor devices

An integrated circuit incorporating high voltage semiconductor devices which are controlled by low voltage semiconductor devices is disclosed, including a method for making the same. The low voltage devices which are capable of realizing complex logic functions on the same chip are realized with only one simple extra step in the fabrication process as compared with the process used to fabricate discrete high voltage power transistors. The process addition to implant the low voltage device does not significantly degrade the original capability associated with discrete power transistors. Both laterally developed and vertically developed devices are described. The integrated circuit combines I2 L logic with power Darlington transistors. A large area ion implantation permits one to fabricate both low and high voltage devices on one substrate. The resulting integrated circuit permits a plurality of loads to be controlled by a simple or complex control function.