Patent ID: 9640528
Date: 2017-05-02
CPC Classifications: H01L

Claim:
1. A bipolar complementary-metal-oxide-semiconductor (BiCMOS) device comprising: a CMOS device in a CMOS region of a substrate; a first well in said CMOS region; an NPN bipolar device in a bipolar region of said substrate; a second well in said bipolar region; a sub-collector of said NPN bipolar device reaching a top surface of said substrate, said sub-collector surrounding a selectively implanted collector; said second well being a collector sinker, said collector sinker being laterally adjacent and electrically connected to said sub-collector of said NPN bipolar device in a laterally overlapping region; wherein said first well in said CMOS region and said collector sinker in said bipolar region form a p-n junction to provide electrical isolation between said CMOS device and said NPN bipolar device; said collector sinker being electrically connected to a collector contact; said sub-collector not extending vertically below said collector sinker.