Data Transmission Device with Automatic Mode Crossover for EMI and Power Optimization
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Solution Overview
Problem
Existing data transmission devices for network apparatus face challenges in power consumption, electromagnetic interference (EMI), and signal quality due to the need to operate in either Class A or Class B modes, which restricts flexibility and increases design complexity and cost, while also experiencing signal loss and distortion.
Innovation Solution
A data transmission device with an automatic crossover function that selects between Class A and Class B modes based on the network apparatus' operating status, using a transmission control unit to generate control commands for a signal adjusting unit, current source generating unit, and mode converting units to optimize power consumption and reduce EMI, and employs one-stage FETs to minimize signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Class A mode is used with constant common-mode current, then EMI and distortion are reduced, but power consumption increases considerably
Solution Approach 1:
The patent implements dynamic switching between Class A and Class B modes based on operating conditions. The system automatically selects Class A mode when low EMI is required and Class B mode when power saving is prioritized, making the operating mode adaptable rather than fixed. This resolves the contradiction by allowing the system to optimize for either EMI reduction or power consumption depending on the specific operating context.
Solution Approach 2:
The patent changes the operating parameters of the differential signal transmitter by switching between Class A (constant common-mode current) and Class B (variable common-mode current) modes. This parameter change allows the system to achieve low EMI when needed while saving power when possible, effectively resolving the contradiction between EMI performance and power consumption.
2Use of energy by moving object
If Class B mode is used with variable common-mode current, then power consumption is reduced, but EMI and distortion increase severely
Solution Approach 1:
The system dynamically switches between Class B mode (for power saving) and Class A mode (for low EMI) based on operating conditions. When the network apparatus requires low EMI performance, the system automatically transitions from Class B to Class A mode, resolving the contradiction by making power consumption adjustable rather than constantly minimized.
Solution Approach 2:
The patent changes the common-mode current parameter from variable (Class B) to constant (Class A) when EMI reduction is required. This parameter change allows the system to achieve low power consumption when possible while maintaining low EMI when needed, effectively resolving the contradiction between power saving and EMI performance.
3Object-affected harmful factors
If mixed Class A/Class B control circuits are used, then EMI and power consumption are controlled, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the control functionality into separate Class A control circuitry and Class B control circuitry, with a switching mechanism that activates only the required segment based on operating mode. This segmentation reduces overall circuit complexity compared to having both control circuits permanently integrated, as the inactive segment can be disabled or minimized.
Solution Approach 2:
The switching mechanism serves multiple functions: it selects between Class A and Class B modes, controls power consumption, and manages EMI performance. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby reducing overall device complexity and manufacturing cost while still achieving EMI and power consumption control.
4Reliability
If extra line driver cells are added to satisfy output voltage swing requirements, then transmission standards are met, but device complexity and cost increase
Solution Approach 1:
The patent changes the output voltage swing parameter dynamically based on the transmission standard being used. By adjusting the voltage swing to match the specific requirements of different transmission standards rather than always using maximum swing, the system can meet compliance requirements with fewer line driver cells, reducing device complexity and cost.
Data Source
AI summary
A data transmission device is applied to a network apparatus having an automatic crossover function, and is connected to a transmission control unit, such that the transmission control unit detects an operating status of the network apparatus and accordingly generates a control command. Thereby, a current source generating unit provides current sources to a first-mode converting unit and a second-mode converting unit according to the control command. This allows a suitable data transmission processing mode to be selected automatically and instantaneously for the operating status of the network apparatus by the current sources from the current source generating unit and the control command generated from the transmission control unit, so as to achieve power saving, low distortion and/or anti-interference.