Programmable xDSL Driver Circuit With Adaptive Supply Voltage
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Solution Overview
Problem
Existing xDSL driver circuits require separate hardware for different DSL standards, such as ADSL and VDSL, lacking flexibility and necessitating hardware swaps when switching between standards, which is laborious for users.
Innovation Solution
An xDSL multistandard driver circuit with an operational amplifier and signal monitoring circuit, adjustable gain, and variable voltage supply, allowing programming for different xDSL standards using an operating mode control signal, enabling the same hardware to support multiple standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate hardware is used for different DSL standards, then each standard can be optimized for its specific requirements, but hardware swaps are required when switching between standards, which is laborious and reduces adaptability
Solution Approach 1:
The driver circuit is designed with a universal architecture that can support multiple DSL standards (ADSL, VDSL, HDSL, IDSL, MDSL, RADSL, RDSL, SDSL) through software configuration rather than hardware changes. The circuit includes programmable components such as feedback resistors controlled by switching devices and adjustable operational amplifiers that can be reconfigured via control signals to match different standard requirements, eliminating the need for physical hardware swaps.
Solution Approach 2:
The driver circuit incorporates dynamically adjustable parameters including supply voltage levels, feedback resistor values, and operational amplifier gain settings that can be changed in real-time based on the selected DSL standard. Control circuits modify these parameters through switching devices and programmable components, allowing the same hardware to adapt its characteristics to match different standard requirements without physical reconfiguration.
2Adaptability or versatility
If hardware is designed for specific DSL standards, then performance can be optimized for that standard, but the device complexity increases when supporting multiple standards through separate hardware units
Solution Approach 1:
The patent merges multiple standard-specific circuits into a single unified driver circuit architecture. Instead of having separate hardware units for ADSL, VDSL, HDSL, and other standards, the invention combines them into one circuit that uses shared operational amplifiers, transformers, and output stages. The complexity is managed through control circuits that dynamically reconfigure the shared components using switching devices and programmable resistors, reducing overall device complexity while maintaining multi-standard support.
Solution Approach 2:
The driver circuit supports multiple DSL standards by changing operational parameters rather than hardware configuration. Supply voltage levels, feedback resistor values, and operational amplifier gain settings are adjusted through control signals and switching devices to match different standard requirements. This parameter-based adaptation allows a single hardware design to support multiple standards without increasing physical complexity.
3Power
If the operational amplifier delivers higher output current to achieve required output power with increasing transformer ratio, then the output power requirement is met, but the supply voltage required decreases, creating a trade-off in power delivery capability
Solution Approach 1:
The driver circuit uses dynamically adjustable supply voltage for the operational amplifier based on the selected DSL standard and operating conditions. Control circuits monitor the required output power and adjust the supply voltage levels accordingly, allowing the circuit to operate efficiently across different power requirements. This dynamic voltage adjustment optimizes the balance between output current delivery and supply voltage consumption.
Solution Approach 2:
The circuit changes the supply voltage parameter of the operational amplifier based on the transformer ratio and required output power. By adjusting this electrical parameter, the circuit can maintain optimal performance across different power delivery scenarios without requiring fixed high-voltage or high-current design constraints, thereby resolving the trade-off between power delivery capability and supply voltage requirements.
Data Source
AI summary
An electric circuit for amplifying an xDSL signal comprises an operational amplifier and a signal monitoring circuit. The operational amplifier is configured to amplify the xDSL signal, is powered by a variable voltage supply and has a gain which is adjustable by an operating mode control signal. The signal monitoring circuit is activated by the operating mode control signal and is configured, when activated by the operating mode control signal, to generate a control signal to adjust the voltage of the variable voltage supply in order to adjust the maximal signal swing of the output signal of said operational amplifier. The control signal is generated by comparing the amplitude of the xDSL signal applied to the electric circuit with an amplitude threshold value.