Patent ID: 7504677

Claim:
An n-channel enhancement mode field effect transistor (FET) radio frequency (RF) switch, comprising: a first source; a second source coupled to the first source; a first RF input/output (I/O) port coupled to the first and second sources; a first drain; a second drain; a second RF input/output (I/O) port coupled to the first drain; a third RF I/O port coupled to the second drain; multiple parallel coupled first gate regions serially arranged and spaced apart between the first source and first drain; multiple parallel coupled second gate regions serially arranged and spaced apart between the second source and the second drain; first and second lightly doped n-regions, wherein each first gate region is separated from each other first gate region by the first and second lightly doped n-regions; a first more heavily doped n-region as compared with the first and second lightly doped n-regions, which is located between the first gate regions, separating the first and second lightly doped n-regions; third and fourth lightly doped n-regions, wherein each second gate region is separated from each other second gate region by the third and fourth lightly doped n-regions; and a second more heavily doped n-region as compared with the third and fourth lightly doped n-regions, which is located between the second gate regions, separating the third and fourth lightly doped n-regions.