Patent ID: 11955488
Assignee: CAMBRIDGE GAN DEVICES LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An III-nitride semiconductor based heterojunction power device comprising:
a first heterojunction transistor formed on a substrate, the first heterojunction transistor comprising:
a first III-nitride semiconductor region formed over the substrate, wherein the first III-nitride semiconductor region comprises a first heterojunction comprising at least a first two dimensional carrier gas of a second conductivity type;
a first terminal operatively connected to the first III-nitride semiconductor region;
a second terminal laterally spaced from the first terminal and operatively connected to the first III-nitride semiconductor region;
a first gate region being formed over the first III-nitride semiconductor region, and between the first terminal and the second terminal; and

a second heterojunction transistor formed on the substrate, the second heterojunction transistor comprising:
a second III-nitride semiconductor region formed over the substrate, wherein the second III-nitride semiconductor region comprises a second heterojunction comprising at least a second two dimensional carrier gas of the second conductivity type;
a third terminal operatively connected to the second III-nitride semiconductor region;
a fourth terminal laterally spaced from the third terminal in a first dimension and operatively connected to the second III-nitride semiconductor region;
a first plurality of highly doped semiconductor regions of a first conductivity type formed over the second III-nitride semiconductor region, the first plurality of highly doped semiconductor regions being formed between the third terminal and the fourth terminal;
a second gate region operatively connected to the first plurality of highly doped semiconductor regions,

wherein one of the first heterojunction transistor and the second heterojunction transistor is an enhancement mode field effect transistor and the other one of the first heterojunction transistor and the second heterojunction transistor is a depletion mode field effect transistor;
wherein the first heterojunction transistor further comprises at least one highly doped semiconductor region of the first conductivity type formed over the first III-nitride semiconductor region, the at least one highly doped semiconductor region formed between the first terminal and the second terminal, and
wherein the first gate region is formed over the at least one highly doped semiconductor region.