Method for impedance matching between differential vias and transmission lines
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsShou-Kuo Hsu, Cheng-Hong Liu
Life of this patent
Estimating the term…
Abstract
A method for impedance matching between differential vias and associated transmission lines is provided. The method includes: deducing a relationship of a space between the differential vias, and a radius of the differential vias while a characteristic impedance of the differential vias matches a characteristic impedance of the differential transmission lines; and determining the space and the radius according to the relationship between the space and the radius.
Claims6
A method for impedance matching between differential vias and associated transmission lines, the method comprising the steps of:
- formulating an equation that uses a relationship of a characteristic impedance of the differential vias, a space between the differential vias, and a radius of the differential vias;
- calculating a characteristic impedance of the differential transmission lines as a desired impedance of the characteristic impedance of the differential vias;
- acquiring a relationship between the space and the radius according to the desired impedance and the equation;
- and
- determining the space and the radius according to the relationship between the space and the radius;
- wherein the equation is:
- Z
- =
- cos
-
-
- h
- -
- 1
-
- (
- d
- /
- 2
-
- r
- )
- π
-
- u
- e
- Z is the characteristic impedance of the differential vias, u is a magnetic permeability of each of the differential vias, e is a dielectric constant, d is the distance between the differential vias, and r is the radius of the differential vias.
A method for impedance matching between differential vias and associated transmission lines, the method comprising the steps of:
- deducing an equation that uses a relationship of a space between the differential vias, and a radius of the differential vias while a characteristic impedance of the differential vias matches a characteristic impedance of the differential transmission lines;
- and
- determining the space and the radius according to the relationship between the space and the radius;
- wherein the equation is:
- Z
- =
- cos
-
-
- h
- -
- 1
-
- (
- d
- /
- 2
-
- r
- )
- π
-
- u
- e
- Z is the characteristic impedance of the differential vias, u is a magnetic permeability of each of the differential vias, e is a dielectric constant, d is the distance between the differential vias, and r is the radius of the differehtial vias.
Dependencies are inferred from the claim text.