Process of forming an electronic device including an inductor
View Patent ↗An electronic device can include an inductor overlying a shock-absorbing layer. In one aspect, the electronic device can include a substrate, an interconnect level overlying the substrate, and the shock-absorbing layer overlying the interconnect level. The inductor can include conductive traces and looped wires. The conductive traces can be attached to the conductive traces over the shock-absorbing layer. In another aspect, a process can be used to form the electronic device including the inductor. In still another aspect, an electronic device can a toroidal-shaped inductor that includes linear inductor segments that are connected in series.
1. A process of forming an electronic device comprising:
forming an interconnect level overlying a die substrate, wherein the interconnect level comprises a first interconnect and a second interconnect;
forming a shock-absorbing layer overlying the interconnect level;
patterning the shock-absorbing layer to define a first opening that exposes the first interconnect and a second opening that exposes the second interconnect;
forming conductive traces, wherein:
the conductive traces include a first conductive trace and a second conductive trace;
a via portion of the first conductive trace extends to the first opening of the shock-absorbing layer and is electrically connected to the first interconnect, and a primary pad portion of the first conductive trace overlies the shock-absorbing layer; and
a secondary pad portion of the second conductive trace overlies the shock-absorbing layer, and a via portion of the second conductive trace extends to the second opening of the shock-absorbing layer and is electrically connected to the second interconnect; and
attaching at least one wire to the conductive traces to form an inductor, wherein:
a first wire of the at least one wire is attached to the primary pad portion of the first conductive trace; and
the first wire or a second wire of the at least one wire is attached to the secondary pad portion of the second conductive trace.
2. The process of claim 1 , wherein forming the shock-absorbing layer comprises forming an organic polymer layer.
3. The process of claim 2 , wherein forming the shock-absorbing layer comprises forming the shock-absorbing layer that includes polyimide.
4. The process of claim 2 , wherein forming the conductive traces is performed after patterning the shock-absorbing layer and comprises:
forming a seed layer over the shock-absorbing layer and within the first opening and the second opening;
forming a patterned layer over the seed layer, wherein the patterned layer comprises third openings corresponding to a pattern for the conductive traces;
forming a conductive layer over the seed layer within the third openings;
removing the patterned layer to form exposed portions of the seed layer; and
removing the exposed portions of the seed layer, wherein the conductive traces include remaining portions of the seed layer and the conductive layer.
5. The process of claim 1 , wherein:
forming the conductive traces comprises forming third conductive traces overlying the shock-absorbing layer, wherein each of the third conductive traces includes a primary pad portion and a secondary pad portion; and
attaching the at least one wire further comprises bonding third wires between the primary pad portions and the secondary pad portions of adjacent third conductive traces at areas overlying the shock-absorbing layer.
6. The process of claim 5 , wherein forming the third conductive traces comprises forming the third conductive traces, wherein for each of the third conductive traces, the secondary pad portion is octagonal, and the primary pad portion has a shape other than octagonal.
7. The process of claim 1 , wherein:
forming the interconnect level comprises forming bonding pads;
the process further comprises:
forming a passivation layer over the interconnect level and before forming the shock-absorbing layer, wherein the passivation layer includes an inorganic material;
patterning the passivation layer to define a third opening that exposes the first interconnect, a fourth opening that exposes the second interconnect, and fifth openings that expose the bonding pads;
patterning the shock-absorbing layer comprises patterning the shock-absorbing layer to define sixth openings that expose the bonding pads; and
the process further comprises:
forming conductive pads over the bonding pads; and
attaching other wires between the conductive pads and a packaging substrate, wherein attaching the wires and attaching the other wires are performed during a same operating sequence.
8. The process of claim 7 , wherein forming the conductive traces comprises:
forming a seed layer over the shock-absorbing layer and within the first opening and the second opening;
forming a patterned layer over the seed layer, wherein the patterned layer comprises seventh openings corresponding to a pattern for the conductive traces;
forming a conductive layer over the seed layer within the seventh openings;
removing the patterned layer to form exposed portions of the seed layer; and
removing the exposed portions of the seed layer, wherein the conductive traces include remaining portions of the seed layer and the conductive layer.
9. The process of claim 1 , wherein forming the conductive traces comprises forming the conductive traces that include gold.
10. The process of claim 1 , wherein forming the interconnect level comprises forming bonding pads.
11. The process of claim 10 , wherein further comprising:
forming a passivation layer over the interconnect level and before forming the shock-absorbing layer, wherein the passivation layer includes an inorganic material; and
patterning the passivation layer to define a third opening that exposes the first interconnect, a fourth opening that exposes the second interconnect, and fifth openings that expose the bonding pads.
12. The process of claim 10 , wherein patterning the shock-absorbing layer comprises patterning the shock-absorbing layer to define third openings that expose the bonding pads.
13. The process of claim 10 , further comprising:
forming conductive pads over the bonding pads; and
attaching other wires between the conductive pads and a packaging substrate.
14. The process of claim 13 , wherein attaching the wires and attaching the other wires are performed during a same operating sequence.
15. The process of claim 1 , wherein forming the conductive traces comprises forming the conductive traces such that the conductive traces abut the shock-absorbing layer.
16. The process of claim 1 , wherein forming the shock-absorbing layer comprises forming the shock-absorbing layer that comprises polyimide.
17. The process of claim 16 , wherein forming the conductive traces comprises forming the conductive traces that comprise an adhesion/harrier layer and a conductive layer.
18. The process of claim 1 , wherein forming the conductive traces comprises forming the conductive traces that comprise an adhesion/barrier layer and a conductive layer.
19. The process of claim 1 , further comprising forming a radio-frequency shielding element in a form of a grid.
20. The process of claim 19 , wherein forming the radio-frequency shielding element is performed, such that from a top view of the workpiece, the radio-frequency shielding element surrounds the conductive traces.