Transformer device
A transformer device includes first conductive segments, second segments, and third conductive segments. The second segments include second conductive segments and first bridging segments. The first bridging segments are connected to the first conductive segments to form a first inductor. The third conductive segments include second bridging segments, and the third conductive segments are connected to the second conductive segments to form a second inductor. The first inductor is located on the second inductor. The first bridging segments and the first conductive segments form first interlaced portions along a first direction. The second bridging segments and the second conductive segments form second interlaced portions along a second direction. The first direction is different from the second direction.
1. A transformer device, comprising:
a plurality of first conductive segments formed on a first metal layer;
a plurality of second segments formed on a second metal layer, the plurality of second segments comprising a plurality of second conductive segments and a plurality of first bridging segments, wherein the plurality of first bridging segments are connected to the plurality of first conductive segments to form a first inductor; and
a plurality of third conductive segments formed on a third metal layer, the plurality of third conductive segments comprising a plurality of second bridging segments, wherein the second metal layer is located on the third metal layer, and the plurality of third conductive segments are connected to the plurality of second conductive segments to form a second inductor,
wherein the first inductor is located on the second inductor, the plurality of first bridging segments and the plurality of first conductive segments form a plurality of first interlaced portions along a first direction, the plurality of second bridging segments and the plurality of second conductive segments form a plurality of second interlaced portions along a second direction, and the first direction is different from the second direction.
2. The transformer device of claim 1 , wherein the plurality of first conductive segments form a first spiral coil in a first region and a second spiral coil in a second region, each of the first spiral coil and the second spiral coil has a plurality of windings, and the first spiral coil and the second spiral coil form the first inductor.
3. The transformer device of claim 2 , wherein the first inductor comprises a first port, a second port, and a third port, the plurality of first conductive segments are routed from an outer turn of the first spiral coil to an inner turn of the first spiral coil in the first region, and coupled to an outer turn of the second spiral coil from the first port through a portion of the plurality of first bridging segments, and the plurality of first conductive segments are routed from the outer turn of the second spiral coil to an inner turn of the second spiral coil in the second region, and coupled to the second port from the third port through another portion of the plurality of first bridging segments.
4. The transformer device of claim 3 , wherein the third port is configured to operate as a center tap.
5. The transformer device of claim 2 , wherein one of the plurality of first bridging segments connects a first turn of the first spiral coil to a second turn of the first spiral coil, and is interlaced with one of the plurality of first conductive segments to form one of the plurality of first interlaced portions.
6. The transformer device of claim 2 , wherein a magnetic field generated from the first spiral coil is opposite to a magnetic field generated from the second spiral coil.
7. The transformer device of claim 1 , wherein the plurality of second conductive segments form a first spiral coil in a first region and a second spiral coil in a second region, the first spiral coil and the second spiral coil each have a plurality of windings, and the first spiral coil and the second spiral coil form the second inductor.
8. The transformer device of claim 7 , wherein the second inductor comprises a first port, a second port, and a third port, the plurality of second conductive segments are routed from an outer turn of the first spiral coil to an inner turn of the first spiral coil in the first region, and coupled to an outer turn of the second spiral coil from the first port through a portion of the plurality of second bridging segments, and the plurality of second conductive segments are routed from the outer turn of the second spiral coil to an inner turn of the second spiral coil in the second region, and coupled to the second port from the third port through another portion of the plurality of second bridging segments.
9. The transformer device of claim 8 , wherein the third port is configured to operate as a center tap.
10. The transformer device of claim 7 , wherein one of the plurality of second bridging segments connects a first turn of the first spiral coil to a second turn of the first spiral coil, and is interlaced with one of the plurality of second conductive segments to form one of the plurality of second interlaced portions.
11. The transformer device of claim 7 , wherein a magnetic field generated from the first spiral coil is opposite to a magnetic field generated from the second spiral coil.
12. The transformer device of claim 1 , wherein the plurality of first conductive segments or the plurality of second conductive segments form a first spiral coil in a first region and a second spiral coil in a second region, and the first spiral coil and the second spiral coil each have a plurality of windings, and wherein the plurality of first conductive segments or the plurality of second conductive segments are routed to sequentially form a portion of the plurality of windings of the first spiral coils, the plurality of windings of the second spiral coils, and remaining portions of the plurality of windings of the first spiral coils.
13. The transformer device of claim 12 , wherein the plurality of first conductive segments or the plurality of second conductive segments are routed from an inner turn of the first spiral coil to an outer turn of the first spiral coil in the first region, and the plurality of first conductive segments or the plurality of second conductive segments are routed from the inner turn of the second spiral coil to an outer turn of the second spiral coil in the second region.
14. The transformer device of claim 1 , further comprising:
a plurality of first vias, wherein the plurality of first vias are configured to correspond to a plurality of end disposed in the plurality of first bridging segments to couple the plurality of first bridging segments to the plurality of first conductive segments; and
a plurality of second vias, wherein the plurality of second vias are configured to correspond to a plurality of end configured in the plurality of third conductive segments to couple the plurality of second bridging segments to the plurality of second conductive segments.
15. The transformer device of claim 1 , wherein each of the first inductor and the second inductor is a 8-shaped inductor.
16. The transformer device of claim 1 , wherein a corresponding one of the plurality of first bridging segments is further configured to bridges the first inductor to the second inductor.
17. The transformer device of claim 1 , wherein the first direction is perpendicular to the second direction.
18. The transformer device of claim 1 , wherein a resistance value of the first metal layer is lower than a resistance value of the second metal layer, and the resistance value of the second metal layer is lower than a resistance value of the third metal layer.
19. The transformer device of claim 18 , wherein the first metal layer is an ultra-thick metal (UTM) layer, and the second metal layer is a redistribution layer.
20. The transformer device of claim 1 , wherein the first metal layer is stacked on the second metal layer, and the second metal layer is stacked on the third metal layer.