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

Claim 0:
1. A packaged Doherty amplifier comprising:
a substrate of a semiconductor device enclosed in a package;
a main transistor formed on the substrate; a first edge seal structure formed on the substrate and completely surrounding the main transistor;
a peaking transistor formed on the substrate;
a second edge seal structure formed on the substrate and completely surrounding the peaking transistor; and
wherein the first and second edge seal structures are configured to protect the respective transistors from chips or cracks, formed during a singulation process, from propagating into the active area of the transistors;
wherein the main and peaking transistors are monolithically integrated and the substrate containing both transistors and the first and second edge seal structures are packaged into the amplifier; and
wherein the first and second edge seal structures each comprise at least a first metal layer formed continuously 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.