DC Restoration Circuit for Sync Signal Baseline Drift
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Solution Overview
Problem
Alternating current (AC) coupled links suffer from baseline wander, causing synchronization signals to drift towards common mode voltage during inactivity, leading to timing errors and incorrect triggering in receiving circuits.
Innovation Solution
A DC restoration circuit that holds the synchronization signal at a predefined voltage during inactivity and allows the AC component to pass through during activity, maintaining the signal's integrity and preventing drift towards common mode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC coupling is used in the link, then performance is improved, but baseline wander occurs causing synchronization signals to drift towards common mode voltage during inactivity
Solution Approach 1:
A DC restoration circuit is introduced as an intermediary component between the AC-coupled transmitting and receiving circuits. This circuit actively monitors the synchronization signal and restores the DC component by comparing the received signal with a reference voltage, thereby preventing baseline wander without affecting the AC coupling benefits
Solution Approach 2:
The DC restoration circuit dynamically adjusts the DC level parameter of the synchronization signal by detecting when the signal drifts towards common mode voltage and actively restoring it to the correct DC level, thus maintaining signal integrity while preserving AC coupling performance
2Use of energy by moving object
If the synchronization signal is inactive for a relatively long period of time, then power consumption is reduced, but baseline wander causes timing errors and incorrect triggering
Solution Approach 1:
The DC restoration circuit operates autonomously during signal inactivity by continuously monitoring the synchronization signal level and automatically restoring the DC component when drift is detected, without requiring external intervention or increasing power consumption during active periods
Data Source
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AI summary
In one example implementation, the present disclosure provides a direct current (DC) restoration circuit for restoring the DC component of a synchronization signal provided over an alternating current (AC) coupled link from a transmitting circuit to a receiving circuit. During a period of inactivity in the synchronization signal, the synchronization signal may experience a drift towards the common mode, and may affect the ability for the synchronization signal to properly trigger the receiving circuit. The DC restoration circuit is configured to hold the synchronization signal steady during the period of inactivity, and allow the AC component of the synchronization signal pass through to the receiving circuit during the period of activity to alleviate the problem of baseline drift in the synchronization signal.