Local phase correction
The present invention is directed to integrated circuits and methods thereof. More specifically, embodiments of the present invention provide a local correction for bending communication line pairs. In an IC package, a pair of communication lines is used to provide a physical link for data communication between two or more components. At regions where the pair of communication lines is bent, the inner bend line is extended in length and shaped to match the length of the outer bend line while preserving integrity of its signal propagation characteristics, thereby providing local phase correction. There are other embodiments as well.
1. An integrated circuit device comprising:
a communication path connecting a first component and a second component positioned on the integrated circuit device, the communication path including a first line and a second line wherein:
the communication path comprises a first bend region and a straight region;
the first line and the second line are substantially parallel along the straight region;
the first line and the second line are separated by a first distance at the straight region;
the first line is shaped at the first bend region to match a length of the second line at the first bend region;
the first line and the second line are separated by a second distance at the first bend region;
the communication path is placed offset outward a centerline between the first line and the second line;
the second distance is smaller than the first distance.
2. The device of claim 1 further comprising a second bend region, wherein the second line is shaped at the second bend region.
3. The device of claim 2 wherein the first line the second line are separated by a third distance at the second bend region, the third distance being smaller than the first distance.
4. The device of claim 1 wherein the first bend region is characterized by an insertion loss of less than 2 dB.
5. The device of claim 1 wherein the first bend region is characterized by a mode conversion of less than 10 dB.
6. The device of claim 1 where the first line is characterized by a first impedance value at the first bend region and characterized by a second impedance value at the straight region, the first impedance value being different from the second impedance value.
7. The device of claim 1 wherein the first line and the second line are characterized by a substantially equal width.
8. The device of claim 1 further comprising a single layer dielectric, the first line being positioned on the single layer dielectric.
9. The device of claim 8 further comprising a bottom metal layer serving as a ground plane for the first line and the second line.
10. The device of claim 1 wherein the first component is mounted on a PCB.
11. The device of claim 1 wherein the first line and the second line are differential lines.
12. The device of claim 1 wherein the first line and second line operate substantially in differential mode at the first bend region.
13. The device of claim 1 wherein the first line and second line are coupled transmission lines.
14. An integrated circuit device comprising:
a first component;
a second component;
a communication path connecting the first component and the second component positioned on the integrated circuit device, the communication path including a first line and a second line wherein:
the communication path comprises a first bend region and a straight region;
the first line and the second line are substantially parallel along the straight region;
the first line and the second line are separated by a first distance at the straight region;
the first line and the second line are separated by a second distance at the first bend region;
the communication path is placed offset outward a centerline between the first line and the second line;
the second distance is smaller than the first distance.
15. The device of claim 14 wherein the first component is manufactured according to a 45 nm or smaller process.
16. The device of claim 14 wherein the communication path supports differential and common modes.
17. The device of claim 14 wherein the first line comprises a shaped region at the first bend region to provide phase correction.
18. An integrated circuit device comprising:
a communication path connecting a first component and a second component positioned on the integrated circuit device, the communication path including a first line and a second line wherein:
the communication path comprises a first bend region and a straight region;
the first line and the second line are substantially parallel along the straight region;
the first line and the second line are separated by a first distance at the straight region;
the first line includes an inner bend region a the first bend region;
the second line includes an outer bend region at the first bend region;
the inner bend region is characterized by a first phase;
the outer bend region is characterized by a second phase;
the first line and the second line are separated by a second distance at the first bend region;
the communication path is placed offset outward a centerline between the first line and the second line;
the second distance is smaller than the first distance.
19. The device of claim 18 wherein the first phase and the second phase are substantially matched.
20. The device of claim 18 wherein the first line is shielded.