Patent ID: 11955478
Assignee: CAMBRIDGE GAN DEVICES LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A depletion mode III-nitride semiconductor based heterojunction device, comprising:
a substrate;
a III-nitride semiconductor region formed over the substrate, wherein the III-nitride semiconductor region comprises a heterojunction comprising at least one two-dimensional carrier gas of second conductivity type;
a first terminal operatively connected to the III-nitride semiconductor region;
a second terminal laterally spaced from the first terminal in a first dimension and operatively connected to the III-nitride semiconductor region;
at least two highly doped semiconductor regions of a first conductivity type formed over the III-nitride semiconductor region, the at least two highly doped semiconductor regions being formed between the first terminal and the second terminal; and
an active gate region formed over the at least two highly doped semiconductor regions;
wherein the at least two highly doped semiconductor regions are spaced from each other in a second dimension and wherein the second dimension is perpendicular to the first dimension; and
at least two rows of active gate regions each formed over the at least two highly doped semiconductor regions;
wherein the depletion mode III-nitride semiconductor based heterojunction device has two threshold levels, and wherein the depletion mode III-nitride semiconductor based heterojunction device is configurable to actively switch between:
(i) an off-state, wherein the gate voltage with respect to the source voltage is lower than the first threshold;
(ii) a high resistance mode, wherein the gate voltage with respect to the source voltage is between the first and second threshold levels; and
(iii) a low resistance mode, wherein the when the gate voltage with respect to the source voltage is higher than the second threshold.