Analog Crosstalk Canceller for Connector Signal Integrity
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Solution Overview
Problem
Communication systems face significant challenges in effectively canceling crosstalk between closely located signal lines, particularly due to mechanical assemblies and proximity effects, which lead to unwanted signal interference and difficulty in receiver-side cancellation.
Innovation Solution
An analog transmit side crosstalk cancellation system is implemented, comprising a delay, filter, and amplifier within a connector or cable, which generates a cancellation signal to combine with adjacent signal lines, pre-canceling crosstalk before transmission, thereby reducing signal degradation and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If receiver-side cancellation is used, then crosstalk can be canceled at the receiving end, but large delays are required which increase device complexity and processing requirements
Solution Approach 1:
The patent inverts the conventional approach by implementing crosstalk cancellation at the transmitter instead of the receiver. The system generates cancellation signals from the original transmit signals and combines them with adjacent line signals before transmission, thereby eliminating the need for large delays and complex receiver-side processing while maintaining effective crosstalk cancellation
Solution Approach 2:
The patent applies preliminary action by pre-generating cancellation signals from the original transmit signals before transmission. The cancellation signals are created and combined with adjacent line signals at the transmitter, so that crosstalk is canceled in advance rather than requiring complex post-reception processing with large delays
2Productivity
If lines are located in close proximity to increase connection density, then more signals can be transmitted, but crosstalk coupling between lines increases
Solution Approach 1:
The patent converts the harmful crosstalk coupling effect into a beneficial cancellation mechanism. By using the same electromagnetic coupling that causes crosstalk to also transfer the cancellation signals from one line to adjacent lines, the system transforms the harmful proximity effect into a useful mechanism for reducing net crosstalk while maintaining high connection density
Solution Approach 2:
The patent applies preliminary anti-action by pre-generating cancellation signals that are opposite in polarity to the expected crosstalk. These cancellation signals are combined with the transmit signals before transmission, creating a preemptive counter-action that neutralizes the harmful crosstalk coupling that would otherwise occur due to close line proximity
3Object-generated harmful factors
If mechanical assembly (PCB/connector/cable launch) is optimized, then crosstalk from mechanical sources can be reduced, but manufacturing complexity increases
Solution Approach 1:
The patent replaces mechanical optimization approaches with an electrical signal processing solution. Instead of requiring complex mechanical assembly optimizations to reduce crosstalk, the system uses electrical cancellation signals generated and combined at the transmitter, thereby reducing crosstalk without increasing manufacturing or assembly complexity
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 effectively pre-cancels crosstalk at the transmitter, reducing signal interference and power consumption, simplifying system design and operation, and avoiding the complexity of large delays required in receiver-side cancellation.
Implementation Method 1
a delay configured to receive and delay a first communication signal from a first line
Implementation Method 2
An analog filter then receives and filters the delayed signal to create a filtered signal
Implementation Method 3
an amplifier receives and amplifies the filtered signal to create a cancellation signal
Implementation Method 4
A junction is also provided to combine the cancellation signal with a second communication signal on a second line
Data Source
AI summary
An analog transmit side crosstalk cancellation system is disclosed which is located at or near the connector of a communication channel, cable, or backplane. When configured as a connector, multiple signal paths are provided within the cancellation system. Input nodes and output nodes provide access into the connector of a received signal and out of the connector for processed signals. The crosstalk canceller comprises a delay, a filter, and an amplifier. These elements operate in conjunction to generate crosstalk cancellation signals. For a particular received signal, cancellation signals are combined therewith from one or more adjacent channels. The crosstalk cancellation system may be configured as part of a connector or an intermediary device between the communication device or card and conductors. The connector may be attached to the communication device or as part of the cable.