Equalizer Active Feedback for AC-Coupled Baseline Wander Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Computing systems face challenges in reducing baseline wander due to AC coupling, which results in power dissipation and large passive components, especially in integrated circuits, as devices have different electrical operating parameters and lack a common DC reference.
Innovation Solution
A filter circuit with capacitors and feedback networks, including resistors, is used to generate filtered signals and amplify voltage differences, reducing baseline wander by adjusting DC common mode operating voltages and minimizing power consumption through dynamic voltage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If AC coupling is used to connect devices with different electrical operating parameters, then adaptability between devices is improved, but baseline wander occurs and requires large passive components and high power dissipation for correction
Solution Approach 1:
The patent implements dynamic baseline wander correction by continuously adjusting the DC common mode voltage levels at the transmitter and receiver ends based on feedback signals. The system dynamically tracks and compensates for baseline wander rather than using static large passive components, thereby reducing power dissipation while maintaining adaptability for AC-coupled communication between devices with different electrical parameters.
Solution Approach 2:
The patent employs feedback mechanisms where the receiver detects baseline wander and sends correction signals back to the transmitter. The transmitter adjusts its DC common mode voltage based on this feedback, creating a closed-loop system that actively compensates for baseline wander. This feedback-based approach replaces the need for large passive components and reduces overall power dissipation while maintaining device adaptability.
2Adaptability or versatility
If AC coupling is used to connect devices with different electrical operating parameters, then adaptability between devices is improved, but baseline wander occurs and requires large passive components
Solution Approach 1:
The patent replaces static large passive components with dynamic voltage adjustment mechanisms. By continuously adapting the DC common mode voltage levels based on detected baseline wander, the system achieves baseline wander correction without requiring large fixed capacitance or inductance values, thereby reducing the size of passive components while maintaining adaptability for AC-coupled devices.
Solution Approach 2:
The feedback mechanism enables the system to actively track and compensate for baseline wander, replacing the need for large passive components that would be required for passive correction approaches. The receiver detects baseline wander and sends feedback to the transmitter, which adjusts its DC voltage levels accordingly, achieving correction with minimal passive component size.
3Reliability
If filter circuit and equalizer circuit are used to correct baseline wander, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent uses feedback-based DC voltage adjustment as a simpler alternative to complex filter and equalizer circuits. The receiver detects baseline wander and sends feedback to the transmitter, which adjusts its DC common mode voltage accordingly. This feedback mechanism achieves signal quality improvement with less circuit complexity compared to traditional filter and equalizer approaches.
Solution Approach 2:
The patent introduces feedback signals as an intermediary mechanism to convey baseline wander information from the receiver to the transmitter. This intermediary feedback approach enables coordinated DC voltage adjustment between transmitter and receiver, achieving signal quality improvement with simpler circuits compared to complex filter and equalizer designs.
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
The solution effectively mitigates baseline wander while reducing power dissipation and allowing for smaller on-chip passive components, thereby minimizing bit error rates and circuit complexity.
Implementation Method 1
a filter circuit may be configured to filter first and second input signals, received via a communication link, to generate first and second filtered signals
Implementation Method 2
An equalizer circuit may amplify a difference between voltage levels of the first and second input signals to generate first and second output signals
Implementation Method 3
A first feedback network may couple the first output signal to the first filtered signal, and a second feedback network may couple the second output signal to the second filtered signal
Implementation Method 4
the filter circuit includes a plurality of capacitors
Implementation Method 5
The first feedback network may include one or more first resistors. The second feedback network may include one or more second resistors
Data Source
AI summary
A method and apparatus for correcting baseline wander is disclosed. The method and apparatus may include generating filtered signals by filtering input signals using a filter circuit. An equalizer circuit using the filtered signals may generate output signals. Feedback networks may be configured to couple a respective output signal to a corresponding filtered signal.