Patent ID: 6803269
Filing Date: 2004-10-12
Classification: H01L,Y10S

Abstract:
A method of forming a varactor diode in a substrate, comprising:forming a well region of a first conductivity type in the substrate; forming a plurality of isolation regions on upper portions of the well region; forming a plurality of masking structures having first and second sides formed on the substrate between respective ones of said plurality of isolation regions; forming a first plurality of diffusion regions of a second conductivity type, at least some of said firs plurality of diffusion regions abutting respective ones of said plurality of isolation regions and at least a first of said first plurality of diffusion regions that does not abut respective ones of said plurality of isolation regions; and forming a second plurality of diffusion regions of said first conductivity type, a first of said second plurality of diffusion regions abutting portions of said at least first of said first plurality of diffusion regions, said second plurality of diffusion regions extending below respective sides of respective ones of said plurality of masking structures, wherein respective ones of said second plurality of diffusion regions do not contact one another.