Communications Plug Capacitors for Crosstalk Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current communications connectors fail to effectively cancel crosstalk across a wide frequency range due to the phase change between offending and compensating crosstalk signals, leading to residual crosstalk interference in high-frequency communications systems.
Innovation Solution
The introduction of capacitors in communications plugs and jacks that inject crosstalk after the plug-jack mating point, aligning offending and compensating crosstalk vectors in time to ensure complete cancellation across all frequencies, using capacitors connected to non-signal current carrying portions of the plug and jack contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional communications connectors are used, then basic signal transmission is achieved, but crosstalk interference increases at high frequencies due to phase changes between offending and compensating signals
Solution Approach 1:
The patent applies preliminary action by injecting compensating crosstalk signals through capacitors at a point before the mating interface, anticipating the phase changes that will occur during signal transmission. This allows the compensating signals to be pre-positioned to counteract the offending crosstalk effectively across a wide frequency range, rather than attempting correction after the damage is done.
Solution Approach 2:
The patent employs parameter changes by using capacitors with specific values (e.g., 0.01pF to 0.1pF) to adjust the timing and phase of compensating crosstalk signals. By varying the capacitance parameters, the system can optimize the cancellation effect across different frequency ranges, transforming the fixed-phase compensation into a dynamically adjustable solution that maintains effectiveness as frequency changes.
2Reliability
If capacitors are introduced to inject compensating crosstalk, then crosstalk cancellation is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing capacitors that can be integrated into existing connector structures without requiring separate compensation modules. The same capacitor components serve multiple functions: they provide crosstalk compensation, maintain signal integrity, and can be positioned to work across different connector types and frequency ranges, reducing overall system complexity despite the addition of compensation capability.
Solution Approach 2:
The patent applies self-service by configuring the capacitors to automatically generate compensating crosstalk signals based on the offending signals present in the transmission line. The system does not require external control or adjustment mechanisms; the capacitors inherently provide the necessary phase correction and signal timing adjustments, eliminating the need for complex control circuits or manual calibration systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces crosstalk levels, allowing for higher frequency communications by ensuring that compensating crosstalk vectors match offending crosstalk vectors in magnitude and polarity, resulting in improved crosstalk cancellation and increased communication performance.
Implementation Method 1
a first capacitor that injects crosstalk from a first of the tip plug contacts to a first of the ring plug contacts
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Communications plugs are provided that include a plug housing. A plurality of plug contacts are mounted in a row at least partly within the plug housing. The plug contacts are arranged as differential pairs of plug contacts. Each of the differential pairs of plug contacts has a tip plug contact and a ring plug contact. A first capacitor is provided that is configured to inject crosstalk from a first of the tip plug contacts to a first of the ring plug contacts at a point in time that is after the point in time when a signal transmitted through the first of the tip plug contacts to a contact of a mating jack reaches the contact of the mating jack.