Reconfigurable Common-Mode Feedback for RF Front-End Cross-Talk
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Solution Overview
Problem
Conventional time-interleaved analog-to-digital converters (ADCs) face performance degradation due to common-mode cross-talk between RF-FE channels when processing different input signals, leading to accuracy issues and instability in common-mode feedback loops.
Innovation Solution
Implementing a reconfigurable common-mode feedback control system that dynamically couples or decouples common-mode feedback loops based on the operation mode of RF-FE channels, using a reconfiguration switch to maintain stability and minimize cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common-mode feedback loop is shared across multiple RF-FE channels, then device complexity is reduced, but common-mode cross-talk occurs between channels when processing different input signals
Solution Approach 1:
The patent implements a reconfigurable common-mode feedback system where the feedback loops can dynamically switch between coupled and decoupled states based on operational mode. When processing different input signals, the loops are decoupled to prevent cross-talk; when processing identical signals, the loops are coupled to reduce complexity. This dynamic reconfiguration resolves the contradiction by adapting the feedback structure to operational requirements.
Solution Approach 2:
The patent segments the common-mode feedback system into multiple independent feedback loops, one for each RF-FE channel. This segmentation allows each channel to have its own dedicated feedback path, eliminating cross-talk between channels when processing different signals, while still maintaining the ability to couple them together when processing identical signals to reduce overall system complexity.
2Object-affected harmful factors
If separate common-mode feedback loops are used for each RF-FE channel, then cross-talk between channels is eliminated, but device complexity increases
Solution Approach 1:
The reconfigurable architecture allows the system to switch between having coupled feedback loops (reducing complexity) and decoupled feedback loops (eliminating cross-talk). The feedback loops are not permanently separate but can be dynamically configured based on operational needs, thus eliminating cross-talk only when necessary while reducing complexity when channels process identical signals.
Solution Approach 2:
The common-mode feedback loops are designed to serve multiple functions: they can operate independently to eliminate cross-talk, or be coupled together to reduce complexity. This multi-functionality allows the same feedback structure to adapt to different operational scenarios, providing both cross-talk elimination and complexity reduction as needed.
3Object-affected harmful factors
If additional components are added to prevent cross-talk between RF-FE channels, then cross-talk is eliminated, but manufacturing cost increases
Solution Approach 1:
The patent uses reconfigurable switches that can couple or decouple feedback loops based on operational mode without requiring additional isolation components for each channel. The same switching infrastructure used for signal routing is leveraged to control feedback loop connectivity, eliminating cross-talk through dynamic configuration rather than through additional passive components that would increase manufacturing cost.
4Object-affected harmful factors
If complex digital post-processing is used to correct cross-talk effects, then cross-talk is compensated, but device complexity and processing time increase
Solution Approach 1:
The patent extracts and eliminates the source of cross-talk at the common-mode feedback stage, rather than allowing it to manifest in the output signals and requiring digital post-processing for correction. By preventing cross-talk generation through reconfigurable feedback loops, the system avoids the need for complex digital signal processing to compensate for cross-talk effects, thereby reducing overall system complexity and processing time.
Data Source
AI summary
A radio frequency front-end (RF-FE) device with a reconfigurable common-mode feedback control. The device includes a plurality of RF-FE channels and a reconfiguration switch. An RF-FE channel includes a common-mode feedback loop. The common-mode feedback loop is configured to detect a common-mode signal in differential signals in the RF-FE channel and generate a feedback signal to set the common-mode signal. The reconfiguration switch is configured to couple common-mode feedback loops of two or more RF-FE channels based on an operation mode. The reconfiguration switch may be controlled to couple common-mode feedback loops of two or more RF-FE channels if the two or more RF-FE channels receive a same input signal and decouple common-mode feedback loops of two or more RF-FE channels if the two or more RF-FE channels receive different input signals.