Patent ID: 6265728
Filing Date: 2001-07-24
Classification: H01L

Abstract:
A compound semiconductor device comprising:a first field effect transistor defining a first active region in a semi-insulating substrate, the first field effect transistor having a first ohmic source electrode and a first ohmic drain electrode extending over the first active region, and a first gate electrode; anda second field effect transistor defining a second active region in the semi-insulating substrate, the second field effect transistor having a second ohmic source electrode and a second ohmic drain electrode extending over the second active region, and a second gate electrode;wherein, a first ratio of a difference between a surface area of the first active region and a combined surface area of the first source and drain ohmic electrodes to the combined surface area of the first source and drain ohmic electrodes is the same as a second ratio of a difference between a surface area of the second active region and a combined surface area of the second source and drain ohmic electrodes to the combined surface area of the second source and drain ohmic electrodes, even when a physical width of said first gate electrode is different than a physical width of said second gate electrode, and wherein a material of the ohmic electrodes has an ionization tendency which is greater than an ionization tendency of a dopant in the active region.