Adjustable Termination Resistor for High-Speed Signal Integrity
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Solution Overview
Problem
Existing driving circuits with constant termination resistors face impedance mismatch issues during high-speed signal transmission, leading to signal distortion and interference, particularly in non-volatile memory devices and electronic devices with fast operation speeds.
Innovation Solution
A driving circuit with adjustable termination resistors using resistive memory elements, where a monitoring circuit adjusts the resistance based on current passing through the resistors to maintain optimal impedance matching, thereby reducing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant termination resistor is used in high-speed signal transmission, then the circuit structure is simple, but impedance mismatch occurs leading to signal distortion and interference
Solution Approach 1:
The patent applies the dynamics principle by transforming the static termination resistor into a dynamic adjustable one. The termination resistor's resistance value can be dynamically adjusted based on operating conditions to maintain impedance matching. This is achieved by integrating a resistive memory element that can change its resistance state, allowing the termination resistor to adapt to varying signal frequencies and transmission line characteristics, thereby preventing signal distortion and interference while maintaining reasonable circuit complexity.
Solution Approach 2:
The patent applies the parameter changes principle by modifying the resistance parameter of the termination resistor. Instead of using a fixed resistance value, the system changes the resistance parameter dynamically to match the impedance of the transmission line at different operating conditions. This is accomplished through the resistive memory element which can switch between different resistance states, ensuring optimal signal transmission across varying frequencies and reducing harmful reflections.
2Productivity
If the operation speed of electronic devices is increased to reduce latency, then productivity improves, but signal transmission is more easily affected by external noise and reflected signals
Solution Approach 1:
The patent applies the feedback principle by implementing a monitoring circuit that detects the actual operating conditions and signal quality, and uses this information to adjust the termination resistor's resistance value. The monitoring circuit provides feedback about the signal transmission environment, enabling the termination resistor to adaptively compensate for noise and reflected signals. This closed-loop control ensures that even at high operation speeds, signal integrity is maintained by dynamically optimizing the termination impedance based on real-time conditions.
Solution Approach 2:
The patent applies the dynamics principle by making the termination resistor dynamic rather than static. As operation speed increases, the resistive memory element can change its resistance state to maintain proper impedance matching. This dynamic adjustment capability allows the system to handle high-speed signals effectively by adapting to the changed transmission characteristics and reducing the impact of noise and reflections that become more prominent at higher speeds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adjustable termination resistors effectively mitigate signal distortion and interference by dynamically adjusting resistance to match changing electrical characteristics, enhancing signal integrity and reducing latency in high-speed data transmission.
Implementation Method 1
the resistance of the memory element can be changed by applied voltage or applied current
Implementation Method 2
The monitoring circuit is configured to monitor a first current passing through the first termination resistor
Data Source
AI summary
An embodiment of a driving circuit is provided. The driving circuit is coupled to an I/O pad. The driving circuit includes an output driver, a first termination resistor, a second termination resistor and a monitoring circuit. The output driver outputs an output data via the I/O pad. The first termination resistor and the second termination resistor are coupled to a node between the output driver and the I/O pad. The monitoring circuit monitors a first current passing through the first termination resistor and adjusts resistance of the first termination resistor and the second termination resistor according to the first current.