Method for high-frequency tuning an electrical device
View Patent ↗The invention relates to a method for high-frequency tuning a high-frequency plug connector, comprising a printed circuit board that has both contact points for high-frequency contacts as well as contact points for insulation displacement contacts. Each contact point for the high-frequency contacts is connected to one respective contact point for the insulation displacement contacts. Capacitive couplings, which cause a near-end crosstalk, occur between the high-frequency contacts. At least one first conductor path, which is connected on only one side to a contact point of an electrical contact, is situated on the printed circuit board that, together with at least one second conductor path, which is situated on and/or in the printed circuit board, forms a capacitor. At least one frequency-dependent parameter of the device is measured, and this frequency-dependent parameter is compared to a set parameter and, according to on a difference between the two, the conductor path that is contacted on one side is partially removed or completely separated.
1. A method for RF matching on a printed circuit board, the printed circuit board having a plurality of contact points for electrical contacts, the printed circuit board including at least a first conductor track connected to a first pair of the electrical contacts and a second conductor track connected to a second pair of the electrical contacts, wherein a first end of the first conductor track is connected to a contact point of one of the electrical contacts, and wherein the second conductor track forms a capacitor with the first conductor track, the method comprising:
measuring near-end crosstalk between the first and second pairs of electrical contacts of the printed circuit board to obtain a first reading of near-end crosstalk;
removing at least a first portion of the first conductor track from the printed circuit board;
measuring the near-end crosstalk between the first and second pairs of electrical contacts of the printed circuit board to obtain a second reading of near-end crosstalk subsequent to removing at least the first portion of the first conductor track; and
removing at least a second portion of the first conductor track from the printed circuit board, a size of the second portion to be removed being determined based on an analysis of the first and second readings of near-end crosstalk and a size of the removed first portion.
2. The method as claimed in claim 1 , wherein the near-end crosstalk is caused by capacitive coupling between at least two of the electrical contacts on the printed circuit board.
3. The method as claimed in claim 1 , wherein the near-end crosstalk is measured on the printed circuit board when the printed circuit board is unpopulated.
4. The method as claimed in claim 1 , wherein near-end crosstalk is measured as a frequency-dependent parameter.
5. The method as claimed in claim 1 , wherein the first and second portions of the first conductor track are removed using a laser.
6. The method as claimed in claim 5 , wherein the laser is controlled, at least in part, based on data obtained by an optical system.
7. The method as claimed in claim 1 , further comprising:
determining a series of profiles indicating attenuation as a function of conductor track size based on potential tolerances of the printed circuit board.
8. The method as claimed in claim 7 , wherein removing at least the second portion of the first conductor track based on the first and second readings of near-end crosstalk comprises:
selecting one of the profiles of the series based on the analysis of the first and second readings of near-end crosstalk as a first selected profile; and
removing at least the second portion of the first conductor track in accordance with the selected profile.
9. The method as claimed in claim 1 , wherein the printed circuit board includes a second capacitor formed from a third conductor track and a fourth conductor track arranged on the printed circuit board, the third conductor track being associated with a third pair of electrical contacts and the fourth conductor track being associated with a fourth pair of electrical contacts, the method further comprising:
measuring near-end crosstalk between the third electrical contact pair and the fourth electrical contact pair to obtain a third reading of near-end crosstalk;
removing at least a first portion of the third conductor track subsequent to obtaining the third reading of near-end crosstalk;
measuring the near-end crosstalk between the third and fourth pairs of electrical contacts to obtain a fourth reading of near-end crosstalk subsequent to removing at least the first portion of the third conductor track; and
removing at least a second portion of the third conductor track based on the third and fourth readings of near-end crosstalk.
10. The method as claimed in claim 9 , further comprising:
determining a series of profiles indicating attenuation as a function of conductor track size based on potential tolerances of the printed circuit board.
11. The method as claimed in claim 10 , wherein removing at least the second portion of the third conductor track based on the third and fourth readings comprises:
selecting one of the profiles of the series based on an analysis of the third and fourth readings as a second selected profile; and
removing at least the second portion of the third conductor track comprises removing at least the second portion of the third conductor track in accordance with the second selected profile.
12. The method as claimed in claim 1 , wherein the contact points of the printed circuit board include contact points for RF plug contacts and contact points for insulation-displacement contacts, wherein one contact point for each of the RF plug contacts is connected to a contact point for a respective one of the insulation-displacement contacts.
13. The method as claimed in claim 1 , wherein measuring the near-end crosstalk comprises injecting RF signals into contact points of some of the electrical contacts with a network analyzer.
14. The method as claimed in claim 1 , wherein removing at least the first portion of the first conductor track comprises removing at least the first portion of the first conductor track based on a comparison between the first reading and a nominal near-end crosstalk reading.
15. The method as claimed in claim 1 , wherein removing at least the first portion of the first conductor track shortens the first conductor track.
16. The method as claimed in claim 1 , wherein removing at least the first portion of the first conductor track comprises cutting through the first conductor track.