Patent ID: 8525281
Filing Date: 2013-09-03
Classification: G01R,H01L

Abstract:
1. A z-axis semiconductor fluxgate magnetometer comprising: a Semiconductor structure, having a bottom surface, a top surface and a cavity extending from the semiconductor top surface down into the semiconductor structure, wherein the cavity has a side wall surface and a bottom surface that lies above and vertically spaced apart from the bottom surface of the semiconductor structure; a die, having a side wall surface, a bottom surface, a top surface, the top surface having a plurality of conductive pads that provide external connection points for the die; wherein the bottom of the die is adhesively attached to the bottom of the cavity; wherein the die is configured to include drive and sense circuits; a first non-conductive structure, that touches the die and the semiconductor structure and fills the remainder of the cavity, and includes a plurality of openings to exposes the conductive pads of the die, wherein the first non-conductive structure has top surface that is substantially planar; a magnetic core pole structure that touches the first non-conductive structure, wherein the magnetic core pole structure has a longest dimension that lies substantially perpendicular to the substantially planar top surface of the first non-conductive structure; a first trace structure that touches the first non-conductive structure, the first trace structure being conductive, having a top surface that lies substantially in a first plane, being spaced apart from the magnetic core pole structure, and having a loop wrapped around the magnetic core pole structure; a second non-conductive structure, that touches the first non-conductive structure and the first trace structure, and includes a plurality of openings to exposes the conductive pads of the die, wherein the second non-conductive structure has top surface that is substantially planar; a second trace structure that touches the second non-conductive structure, the second trace structure being conductive, having a top surface that lies substantially in a second plane, being spaced apart from the magnetic core pole structure, having a loop wrapped around the magnetic core structure, and being electrically isolated from the first trace structure, the second plane lying above the first plane; a third trace structure that touches the third non-conductive structure, the third trace structure being conductive, having a top surface that lies substantially in a third plane, being spaced apart from the magnetic core pole structure, and being electrically isolated from the second trace structure; a fourth non-conductive structure, that touches the third non-conductive structure and the third trace structure, and includes a plurality of openings to exposes the conductive pads of the die, wherein the fourth non-conductive structure has top surface that is substantially planar; and a fourth trace structure that touches the fourth non-conductive structure, the fourth trace structure being conductive, having a top surface that lies substantially in a fourth plane, being spaced apart from the magnetic core pole structure, and being electrically isolated from the third trace structure; a fifth non-conductive structure, that touches the fourth non-conductive structure and the fourth trace structure, and includes a plurality of openings to exposes the conductive pads of the die, wherein the fifth non-conductive structure has top surface that is substantially planar; a plurality bond pad structures that touch the fifth non-conductive structure and extend through the fifth non-conductive structure to electrically couple to the die; a non-conductive passivation structure that touches the fifth non-conductive structure and the bond pad structures, wherein the non-conductive passivation structure has a substantially planar surface.