Patent ID: 8729695

Claim:
A wafer level package comprising: a device wafer including a MEMS device; a cap wafer disposed over the device wafer; at least one first interconnect disposed between the device wafer and the cap wafer and configured to provide an electrical connection between the device wafer and the cap wafer; and a conformal sealing ring disposed between the device wafer and the cap wafer and configured to surround the at least one first interconnect and the MEMS device so as to provide a conformally sealed environment for the at least one first interconnect and the MEMS device; wherein the conformal sealing ring is configured to conform to a respective suitable surface of the device wafer and the cap wafer when the device wafer is bonded to the cap wafer; wherein the wafer level package further comprises a first electrical interconnect disposed on a first cap surface of the cap wafer and in electrical contact with the at least one first interconnect; wherein the first electrical interconnect is configured to route the at least one first interconnect along the first cap surface of the cap wafer to crossing the conformal sealing ring to the outside of the sealed environment; wherein the wafer level package further comprises a cap dielectric layer disposed on the first cap surface of the cap wafer, a ground contact disposed on the cap dielectric layer, and a first electrical interconnect dielectric layer disposed over the ground contact; wherein the conformal sealing ring is connected to the ground contact via an opening in the first electrical interconnect dielectric layer.