Patent ID: 7537982
Filing Date: 2009-05-26
Classification: H01L

Abstract:
1. A method of isolating noise in an integrated circuit, the method comprising: forming a first circuit region in a substrate; forming a second circuit region in the substrate; performing a first proton bombardment to form a first semi-insulating region between the first circuit region and the second circuit region, wherein the first semi-insulating region extends from a top surface of the substrate into the substrate; forming a first guard ring extending from the top surface of the substrate into the substrate, wherein the first guard ring is between the first and the second circuit region, and is adjacent the first semi-insulating region; performing a second proton bombardment to form a second semi-insulating region, wherein the second semi-insulating region extends from a surface of a backside of the substrate into the substrate; and forming a guard layer on the second semi-insulating region from the backside of the substrate.