Patent ID: 8216910

Claim:
A method of forming Heterojunction Bipolar Transistors (HBTs) on a wafer, said method comprising: providing a group III-V compound semiconductor based substrate; forming of HBT layers up to and including a collector layer on said substrate; forming at least a first lightly doped collector region in said collector layer for a least one high F t HBT; forming at least a second lightly doped collector region in said collector layer for a least one high breakdown voltage (BVceo) HBT, wherein a thickness of the first lightly doped collector region for the high F t HBT is less that a thickness of the second lightly doped collector region for the high breakdown voltage (BVceo) HBT; implanting first ions through said first lightly doped collector region to form a first implant region in said collector layer; implanting second ions through said second lightly doped collector region to form a second implant region in said collector layer; and annealing said wafer.