Selectable Termination Circuits for Impedance Mismatch Control
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Solution Overview
Problem
Semiconductor devices face signal distortion due to impedance mismatch, particularly at increased operation speeds and reduced power consumption, which existing technologies struggle to address effectively.
Innovation Solution
The semiconductor device incorporates first and second termination circuits with adjustable impedance values, controlled by selection termination control signals and a termination control signal, allowing for precise impedance setting based on logic level combinations to prevent signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If operation speed is increased and power consumption is reduced, then performance is improved, but signal distortion occurs due to impedance mismatch
Solution Approach 1:
The patent implements dynamic impedance adjustment by controlling termination circuits through mode registers and control signals. The impedance values of termination circuits are changed based on operation modes (e.g., read/write modes, speed grades) to match source and load impedances at different operating conditions, thereby preventing signal distortion while maintaining high speed and low power consumption
Solution Approach 2:
The patent changes impedance parameters of termination circuits according to different operation modes and speed grades. By adjusting the impedance values (e.g., between 240Ω and 50Ω) through control signals and mode register settings, the system optimizes signal transmission for each specific operating condition, resolving the contradiction between high-speed operation and signal integrity
2Reliability
If termination circuits are added to adjust impedance values, then signal distortion is prevented, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the termination circuits, which can operate in different modes (first termination mode, second termination mode, high-impedance mode) based on control signals. The same termination circuit structure serves multiple purposes: impedance matching for different speed grades, support for different operation modes, and power management, thereby reducing the need for separate dedicated circuits for each function
Solution Approach 2:
The patent combines the termination control functionality with the existing mode register and control signal infrastructure. The termination circuits are controlled through the same mode register write operations and control signals used for other device configurations, merging impedance adjustment functionality into the existing control framework rather than requiring separate control mechanisms
Data Source
AI summary
A semiconductor device includes a first termination circuit comprising an impedance value and configured to control the impedance value of the first termination circuit based on a first selection termination control signal and a termination control signal and a second termination circuit comprising an impedance value and configured to control the impedance value of the second termination circuit based on a second selection termination control signal and the termination control signal.