Reconfigurable Ethernet Receiver Front End for Dual-Rate ADC Paths
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Solution Overview
Problem
Current in-vehicle networking technologies, such as CAN and FlexRay, face challenges in meeting the increasing bandwidth requirements of modern automotive applications, and existing Ethernet transceivers struggle to efficiently support both 100 Mbps and 1000 Mbps/1 Gbps Ethernet links while adhering to power efficiency and cost-effectiveness constraints.
Innovation Solution
A reconfigurable Ethernet transceiver with a dual-mode analog front-end circuit that selectively switches between low data rate and high data rate signal paths, utilizing a shared ADC and an upstream ADC with residual signal amplification, to process analog signals and convert them into digital signals, optimizing sampling frequencies and power consumption based on the data rate mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transceivers are used for 100 Mbps and 1000 Mbps Ethernet links, then each standard can be optimally supported, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal transceiver design that can operate in both 100 Mbps and 1000 Mbps modes using a single device. The analog front-end circuit is configured with switchable signal paths that allow the same hardware to adapt to different data rate requirements, eliminating the need for separate transceivers for each Ethernet standard.
Solution Approach 2:
The transceiver employs dynamic reconfiguration capabilities where the analog front-end can switch between different signal processing paths based on the detected data rate. This dynamic adaptation allows the system to optimize its performance for either 100 Mbps or 1000 Mbps operation as needed, providing versatility without requiring multiple fixed devices.
2Reliability
If full ADC functionality is used for both data rates, then signal processing capability is maintained, but power consumption increases
Solution Approach 1:
The patent applies partial action by enabling only the necessary signal processing components for the current operating mode. When operating at 100 Mbps, the system uses a simplified signal path with reduced ADC activity compared to full 1000 Mbps capability. This allows the system to maintain adequate signal processing capability while consuming less power during lower data rate operation.
Solution Approach 2:
The system dynamically changes operating parameters including ADC sampling rates and signal path configurations based on the detected data rate. By adjusting these parameters to match the actual traffic requirements, the system maintains signal processing adequacy for the current mode while reducing power consumption by disabling or scaling back unnecessary processing functions.
3Use of energy by moving object
If simplified signal path is used for power savings, then power consumption decreases, but signal processing capability is reduced
Solution Approach 1:
The patent implements dynamic signal path selection where the system automatically switches between simplified and full-capability processing paths based on the operating mode. The analog front-end includes switchable components that can be activated or deactivated to match the required data rate, ensuring that signal processing capability is always sufficient for the current operation while minimizing power consumption.
Solution Approach 2:
The system adjusts signal processing parameters dynamically by changing the active signal path configuration according to the detected Ethernet standard. This parameter change allows the system to use a simplified path for 100 Mbps operation to save power, while maintaining the capability to activate the full processing path when 1000 Mbps operation is required, thus preserving reliability.
Data Source
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Figure 2b
Figure 3a~3b
AI summary
The present application relates to a reconfigurable analog front-end circuit and a reconfigurable Ethernet transceiver with a reconfigurable analog front-end circuit. The circuit is reconfigurable using the at least one signal-path switching element controlled by a mode signal to operationally establish a first or a second signal path. The first signal path comprises an optional first signal-conditioning section and a shared ADC. The second signal path comprises an optional second signal-conditioning section, an upstream ADC and the shared ADC. The signal paths are selectively switched in response to a mode signal.