Receiver Gain Control for Baseline Wander Without ADC Resolution Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing baseline wander correction circuits in network transmission systems face challenges in preventing data errors caused by baseline wander interference without degrading the resolution of the analog-to-digital converter (ADC), as they require varying reference voltages based on transmission channel length, affecting ADC resolution and error rates.
Innovation Solution
A receiver with baseline wander compensation that dynamically adjusts analog and digital gain stages using a threshold value detector with hysteresis and delay functionality, automatically generating gain control signals to compensate for baseline wander interference, thereby enhancing ADC resolution without increasing the bit number of the ADC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional baseline wander correction circuit uses an ADC reference voltage generator to generate different reference voltages based on transmission channel length, then baseline wander interference is reduced, but ADC resolution is degraded
Solution Approach 1:
The patent implements dynamic gain control by automatically adjusting the reference voltage level based on the actual baseline wander magnitude detected during operation. Instead of using fixed reference voltages for different cable lengths, the system continuously adapts the gain of the baseline wander correction circuit to match the actual interference conditions, thereby preventing ADC clipping while preserving resolution.
Solution Approach 2:
The system changes the reference voltage parameter dynamically based on detected baseline wander characteristics. The baseline wander correction circuit monitors the signal and automatically adjusts the reference voltage level to optimize both baseline wander suppression and ADC resolution, avoiding the need for manual configuration based on cable length.
2Reliability
If a larger reference voltage is used to prevent receiving data error caused by baseline wander interference, then data error is reduced, but ADC resolution is degraded
Solution Approach 1:
The patent employs feedback control where the baseline wander correction circuit continuously monitors the received signal and adjusts the reference voltage level based on the actual baseline wander magnitude. This feedback mechanism ensures that the reference voltage is increased only when necessary to prevent data errors, thereby maintaining optimal ADC resolution under varying interference conditions.
Solution Approach 2:
The system dynamically adjusts the reference voltage level in real-time based on the detected baseline wander characteristics, rather than using a fixed large reference voltage. This dynamic adaptation allows the system to use minimal reference voltage when interference is low (preserving resolution) and increase it only when needed (preventing data errors).
Data Source
AI summary
A receiver with baseline wander compensation is applicable to a digital communication system. The receiver includes an Analog-to-Digital Converter (ADC), a slicer, a threshold value detector, a gain controller, a baseline wander compensator, a delay circuit, an analog gain stage, and a digital gain stage. The baseline wander compensator is used to perform an operation and a filtering process on a voltage obtained prior to processing by the slicer and a voltage after the processing so as to obtain a baseline wander voltage value for compensation and control. The threshold value detector and the gain controller dynamically produce control signals of analog gain and digital gain. The analog gain stage compensates degrading of communication signals passing through transmission channels in an analog gain manner. The delay circuit is used to compensate the delay of the conversion performed by the ADC. The digital gain stage compensates insufficiency of the analog gain.