Patent ID: 11887945
Assignee: WOLFSPEED, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The packaged Doherty amplifier of claim 1, further comprising:
a third transistor formed on the substrate; and a third edge seal structure formed on the substrate and completely surrounding the third transistor;
wherein the third transistor is monolithically integrated with the first and second transistors and the substrate containing the main, peaking, and third transistors and first, second, and third edge seal structures is packaged into the amplifier;
wherein the third edge seal structure is configured to protect the third transistor from chips or cracks formed during a singulation process from propagating into the active area of the transistor; and
wherein the third edge seal structure comprises at least a first metal layer formed on a front side of the substrate, a second metal layer formed on the first metal layer intermittently along its length, and a plurality of through vias connecting the first metal layer to a grounded conductor on a back side of the substrate.