Bypassed gate transistors having improved stability
View Patent ↗A transistor device includes a plurality of gate fingers that extend in a first direction and are spaced apart from each other in a second direction, each of the gate fingers comprising at least spaced-apart and generally collinear first and second gate finger segments that are electrically connected to each other. The first gate finger segments are separated from the second gate finger segments in the first direction by a gap region that extends in the second direction. A resistor is disposed in the gap region.
1 . A transistor device comprising: a semiconductor layer structure;
a source contact on an upper surface of the semiconductor layer structure;
a drain contact on the upper surface of the semiconductor layer structure;
a gate finger on the upper surface of the semiconductor layer structure, the gate finger positioned between the source contact and the drain contact; and
a gate jumper that is electrically connected to at least a portion of the gate finger, the gate jumper positioned above and over the source contact,
wherein the source contact extends continuously on the upper surface of the semiconductor layer structure without any gaps that divide the source contact into segments;
wherein a longitudinal axis of the source contact, a longitudinal axis of the drain contact and a longitudinal axis of the gate finger each extend in the first direction, and
wherein a longitudinal axis of the gate jumper is parallel to the longitudinal axis of the source contact.
2 . The transistor device of claim 1 , wherein the gate finger comprises a plurality of discontinuous gate finger segments.
3 . The transistor device of claim 2 , further comprising a gate bus, wherein at least one of the discontinuous gate finger segments is electrically connected to the gate bus through the gate jumper.
4 . The transistor device of claim 2 , further comprising a gate signal distribution bar that is at a same height above the semiconductor layer structure as the gate jumper, the gate signal distribution bar extending from the gate jumper towards the gate finger.
5 . The transistor device of claim 4 , wherein the gate signal distribution bar is interposed on an electrical path between the gate jumper and at least a portion of the gate finger.
6 . The transistor device of claim 1 , wherein the source contact is on a first major surface of the semiconductor layer structure, the transistor device further comprising:
a source bus layer on a second major surface of the semiconductor layer structure; and
a plurality of source contact plugs that extend through the semiconductor layer structure to electrically connect the source contact to the source bus layer.
7 . The transistor device of claim 6 , wherein the source contact includes at least a first widened portion, a second widened portion and a narrowed portion that physically and electrically connects the first widened portion to the second widened portion.
8 . A transistor device comprising:
a semiconductor layer structure;
a source contact that extends in a first direction on an upper surface of the semiconductor layer structure;
a drain contact that extends in the first direction on the upper surface of the semiconductor layer structure;
a gate finger that extends in the first direction on the upper surface of the semiconductor layer structure, the gate finger positioned between the source contact and the drain contact, wherein the gate finger comprises a plurality of discontinuous gate finger segments;
wherein one of the source contact and the drain contact comprises, on the upper surface of the semiconductor layer structure, a first widened portion, a second widened portion and a narrowed portion that is in between the first widened portion and the second widened portion, and
wherein the first widened portion, the second widened portion and the narrowed portion are each positioned in between the gate finger and the other of the source contact and the drain contact and overlap the gate finger and the other of the source contact and the drain contact in a first direction that is perpendicular to a longitudinal axis of the source contact and that is parallel to a lower surface of the semiconductor layer structure and
wherein a first of the discontinuous gate finger segments is electrically connected to the gate bus through a series gate resistor and is not electrically connected to the gate bus through the gate jumper.
9 . The transistor device of claim 8 , wherein the one of the source contact and the drain contact is the source contact.
10 . The transistor device of claim 8 , wherein the first and second widened portions are wider than the narrowed portion in the first direction.
11 . The transistor device of claim 8 , further comprising a gate bus and a gate jumper that is electrically connected to the gate bus, wherein the gate jumper is positioned above and over one of the source contact and the drain contact, and wherein at least a portion of the gate finger is electrically connected to the gate bus through the gate jumper.
12 . The transistor device of claim 11 , further comprising a gate signal distribution bar that is formed in a same metal layer as the gate jumper, the gate signal distribution bar extending from the gate jumper towards the gate finger.
13 . The transistor device of claim 12 , wherein the gate signal distribution bar is electrically connected to at least a portion of the gate finger by a conductive via.
14 . The transistor device of claim 13 , wherein a plane that is perpendicular to a longitudinal axis of the gate jumper and perpendicular to a plane defined by a bottom surface of the semiconductor layer structure extends through both the narrowed portion of the source contact and the conductive via.
15 . The transistor device of claim 11 , further comprising a conductive via that is in between the narrowed portion of the one of the source contact and drain contact and the other of the source contact and drain contact when the transistor device is viewed from above.
16 . A transistor device comprising: a semiconductor layer structure;
a source contact that extends in a first direction on an upper surface of the semiconductor layer structure;
a drain contact that extends in the first direction on the upper surface of the semiconductor layer structure;
a gate finger that extends in the first direction on the upper surface of the semiconductor layer structure, the gate finger positioned between the source contact and the drain contact and comprising a plurality of discontinuous gate finger segments;
a gate bus;
a gate jumper that is electrically connected to the gate bus, wherein the gate jumper has a longitudinal axis that extends in the first direction and is positioned above the source contact; and
a gate signal distribution bar that is formed in a same metal layer as the gate jumper, the gate signal distribution bar extending from the gate jumper towards a first of the discontinuous gate finger segments,
wherein the gate signal distribution bar is electrically connected to the first of the discontinuous gate finger segments by a conductive via.
17 . The transistor device of claim 16 , wherein the source contact includes, on the upper surface of the semiconductor layer structure, first and second widened sections that are physically and electrically connected to each other by a narrowed section, and wherein the gate jumper is positioned above the source contact and a first of the discontinuous gate finger segments is electrically connected to the gate bus through the gate jumper.
18 . The transistor device of claim 16 , wherein a plane that is perpendicular to a longitudinal axis of the gate jumper and perpendicular to a plane defined by a bottom surface of the semiconductor layer structure extends through both the narrowed section of the source contact and the conductive via.