Embedded inductor for semiconductor device circuit
View Patent ↗An embedded inductor which includes a spiral conductive inductor embedded in a magnetically permeable body composed of particles of pre-sintered magnetically permeable (e.g. ferromagnetic) material and an epoxy binder.
1. A circuit board comprising:
an insulation body;
at least two conductive pads;
a spiral inductor, said inductor including at least two terminals each being electrically connected to a respective conductive pad; and
a magnetically permeable body disposed around said spiral inductor and embedded in said insulation body.
2. The circuit board of claim 1 , wherein said magnetically permeable body includes particles of a pre-sintered magnetically permeable material in a resin binder.
3. The circuit board of claim 2 , wherein said particles are comprised of permalloy.
4. The circuit board of claim 1 , wherein said inductor is comprised of copper.
5. The circuit board of claim 1 , wherein said inductor is comprised of electrically conductive epoxy.
6. The circuit board of claim 5 , wherein said electrically conductive epoxy includes silver particles.
7. The circuit board of claim 1 , wherein said magnetically permeable body comprises NiZn Ferrite.
8. The circuit board of claim 1 , wherein said magnetically permeable body comprises MnZn Ferrite.
9. The circuit board of claim 1 , further comprising an insulated printed circuit board, wherein said magnetically permeable body is disposed over a surface of said insulated printed circuit board.
10. The circuit board of claim 1 , wherein said conductive pads are disposed over either said insulation body or said insulated printed circuit board and each connected electrically to a respective terminal through a via.
11. The circuit board of claim 1 , wherein said magnetically permeable body is ferromagnetic.
12. The circuit board of claim 1 , wherein said pre-sintered magnetically permeable material is a soft ferrite.