Current-Mode Output Driver Slew Rate Control for Multi-Speed I/O
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current I/O interfaces face challenges in backward-compatibility due to limitations in tuning slew rates and meeting strict skew and power requirements, particularly in high-speed data transmission scenarios like SATA, where power consumption and rise/fall times are critical.
Innovation Solution
A method and driver circuit design that incorporates a dual-function voltage- and current-mode differential pre-driver and a current-mode differential output driver, allowing for adjustable slew rate control and power management to accommodate different data transmission generations, enabling efficient power savings while meeting variable rise/fall times and strict differential skew requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a voltage-mode pre-driver is used to drive the output driver, then the circuit can operate at high speeds, but the slew rate tuning range is limited and cannot meet multiple strict skew and slew rate requirements
Solution Approach 1:
The patent implements dynamic slew rate control by providing multiple selectable slew rate settings (first, second, and third settings) that can be configured based on the operating conditions. The circuit transitions from static to dynamic parameter adjustment, allowing the slew rate to be optimized for different data transmission speeds and compatibility requirements.
Solution Approach 2:
The invention changes the slew rate parameter by providing multiple predetermined settings that can be selected based on the operating mode. Different slew rate values are applied depending on whether the circuit operates at high speed or needs backward compatibility, enabling the system to adapt to different standards and requirements.
2Power
If a current-mode pre-driver is used to drive the output driver, then the circuit can provide sufficient drive capability, but it cannot simultaneously meet multiple power requirements with necessary slew and skew considerations
Solution Approach 1:
The patent implements dynamic power management by providing multiple power modes (first, second, and third power modes) that can be selected based on the operating requirements. The circuit can transition between high-power mode for maximum drive capability and lower-power modes for energy-efficient operation, adapting to different system requirements.
Solution Approach 2:
The invention creates a multi-functional pre-driver that can operate in different modes (voltage-mode and current-mode) and provide multiple slew rate settings. This universal design allows the same circuit to meet diverse power requirements while maintaining compatibility with different standards and applications.
3Productivity
If the circuit operates at high data transmission speeds, then productivity increases, but power consumption and skew control become more difficult
Solution Approach 1:
The patent changes operating parameters (slew rate settings and power modes) based on the data transmission speed requirements. The circuit can be configured with appropriate slew rates and power levels for different operating conditions, optimizing the balance between throughput and power consumption for each scenario.
Data Source
AI summary
A method is provided for selecting at least one of a plurality of slew rate control settings based at least upon a speed of data transmission and receiving input data where the input data is received at the data transmission speed. The method also includes switching the received input data in accordance with the selected at least one of a plurality of slew rate control settings and sending output data at the data transmission speed. Also provided is data driver device that includes at least one activation portion comprising one or more slew rate controls, a voltage-mode driver portion and at least a first current-mode driver portion. Also provided is a computer readable storage device encoded with data for adapting a manufacturing facility to create the data driver device. Also provided is a system including the data driver device, a data storage device and a processor device.