Semiconductor resonators with reduced substrate losses
View Patent ↗A resonator includes a laminate, an inductive element on the laminate, and a semiconductor die attached to the inductive element and the laminate. The semiconductor die includes a substrate and a device layout area. The device layout area is separated into a number of device layout sub-areas, each of which has an area between about 1.0 μm 2 and 100.0 μm 2 . By limiting the area of each one of the device layout sub-areas with the charge carrier trap trenches, the total area of the semiconductor die prone to inducement of eddy currents (i.e., the layer of accumulated charge at the interface of the substrate and the device layout area) is reduced, which in turn reduces interference with the magnetic field of the inductive element and thus improves the performance of the resonator.
1. A resonator comprising:
a laminate;
an inductive element on the laminate; and
a semiconductor die coupled to the inductive element, the semiconductor die comprising
a substrate; and
a device layout area on the substrate, the device layout area comprising a plurality of device layout sub-areas separated by a charge carrier trap trench such that an area of each one of the plurality of device layout sub-areas is between about 1.0μ 2 and 100.0μ 2 ; wherein the plurality of device layout sub-areas are arranged in a grid.
2. The resonator of claim 1 wherein the semiconductor die is a silicon-on-insulator (SOI) semiconductor die comprising an insulating layer between the substrate and the device layout area.
3. The resonator of claim 2 wherein the charge carrier trap trench runs through the device layout area and the insulator layer such that a bottom surface of the charge carrier trap trench is in the substrate.
4. The resonator of claim 3 wherein the charge carrier trap trench comprises a trap-rich implant in the bottom surface thereof, the trap-rich implant configured to prevent a collection of charge carriers at an interface between the substrate and the insulator layer.
5. The resonator of claim 4 wherein the charge carrier trap trench is filled with an oxide material.
6. The resonator of claim 1 wherein the inductive element is a three-dimensional inductor.
7. The resonator of claim 1 wherein the resonator has a quality factor between about 50 and 1000.
8. The resonator of claim 1 further comprising a plurality of devices in the plurality of device layout sub-areas which are electrically coupled to the inductive element.
9. The resonator of claim 1 wherein the charge carrier trench comprises the same material as the substrate with a high-resistivity dopant added thereto.
10. The resonator of claim 1 wherein the SOI semiconductor die is at least partially over the inductive element.
11. The resonator of claim 1 wherein the SOI semiconductor die is completely over the inductive element.
12. A resonator comprising:
a laminate;
an inductive element on the laminate; and
a semiconductor die coupled to the inductive element, the semiconductor die comprising
a substrate; and
a device layout area on the substrate, the device layout area comprising a plurality of device layout sub-areas separated by a charge carrier trap trench such that the plurality of device layout sub-areas are arranged in a grid; wherein each device layout area has a width between about 10μm and 200μm.