Memory Module Termination Circuit for Signal Reflection Control
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Solution Overview
Problem
Semiconductor memory devices face signal distortion issues due to increased transmission speeds, particularly signal reflection, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating a termination circuit with a variable resistance control mechanism in semiconductor memory devices to manage signal reflections on command/address buses, allowing for dynamic adjustment of termination resistance based on operation modes and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission speed is increased to improve performance, then productivity is improved, but signal distortion increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the termination resistance value based on operating conditions. The termination circuit can switch between different resistance values (e.g., 50Ω, 75Ω, or high impedance) to optimize signal integrity at different transmission speeds and operating modes, thereby resolving the contradiction between high-speed transmission and signal distortion
Solution Approach 2:
The patent implements dynamics by making the termination resistance adjustable rather than fixed. The termination circuit responds to control signals that change the resistance value based on real-time operating conditions, allowing the system to adapt to varying transmission speeds and minimize signal reflection dynamically
2Reliability
If termination resistors are added to prevent signal reflection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a termination circuit that can serve multiple functions: it can operate as a termination resistor, be completely turned off, or provide partial termination. This multi-functional design allows a single circuit structure to handle different signal integrity requirements without adding multiple separate components, thereby reducing overall device complexity
Solution Approach 2:
The dynamic control of the termination circuit allows it to be activated or deactivated based on operating mode. In certain modes, the termination is completely turned off to simplify the circuit behavior, while in other modes it provides appropriate termination. This dynamic approach reduces the need for permanently active complex termination circuits
3Reliability
If more components are added to reduce signal distortion, then reliability is improved, but substrate space increases
Solution Approach 1:
The termination circuit is designed to integrate multiple functions within a compact structure. By combining the termination resistance element with control circuitry that can adjust or disable the termination function, the design achieves high reliability without requiring separate dedicated components for each function, thereby conserving substrate space
Solution Approach 2:
The ability to change termination resistance parameters allows the circuit to achieve optimal signal integrity with a single adjustable component rather than requiring multiple fixed-value components. This parameter adjustability reduces the total component count and substrate space required while maintaining reliable signal transmission
Data Source
AI summary
A memory module comprises a plurality of semiconductor memory devices each having a termination circuit for a command/address bus. The semiconductor memory devices are formed in a substrate of the memory module, and they operate in response to a command/address signal, a data signal, and a termination resistance control signal.