ODT Control Circuit for Stable Timing in Power-Down Mode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor devices face issues with impedance mismatch due to external noise, power supply voltage variations, and temperature changes, leading to signal distortion and errors in high-speed data transmission, particularly in power-down modes where ODT operations can result in premature on/off timing failures.
Innovation Solution
An ODT control circuit that generates shift clocks during both power-down and non-power-down modes, allowing the shift register to delay the on/off control signal in synchronization with these clocks, ensuring stable on/off timing of the ODT operation and minimizing additional current consumption by generating shift clocks only during ODT operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the ODT operation is performed in power-down mode to reduce power consumption, then power consumption is reduced, but the on/off timing of the ODT operation becomes premature causing failures
Solution Approach 1:
The patent applies dynamics by making the clock generator's operation mode changeable based on system state. The clock generator operates in a first mode during normal operation and switches to a second mode during power-down mode, allowing adaptive timing control that prevents premature ODT operation while maintaining power savings. This dynamic adaptation resolves the contradiction between power consumption and timing reliability.
2Reliability
If the shift clocks are generated continuously to maintain stable ODT timing, then the ODT operation timing is stable, but additional current consumption increases
Solution Approach 1:
The patent implements periodic action by generating shift clocks only during specific periods when ODT operations are actually performed, rather than continuously. The clock generator activates clock generation in response to ODT operation requests, ensuring stable timing when needed while avoiding unnecessary current consumption during idle periods. This periodic operation resolves the contradiction between timing stability and power consumption.
3Use of energy by moving object
If the ODT control circuit operates in power-down mode to minimize power consumption, then power consumption is minimized, but the setup/hold margin is compromised causing malfunctions
Solution Approach 1:
The patent applies parameter changes by modifying the operation parameters of the clock generator based on the power mode. During power-down mode, the clock generator changes its operating parameters to generate shift clocks with appropriate timing characteristics that maintain adequate setup/hold margins. This parameter adaptation allows the system to achieve both low power consumption and adequate timing margins.
Data Source
AI summary
On-die-termination control circuit includes a clock generator configured to generate shift clocks in response to an on/off control signal; and a shift register configured to delay the on/off control signal in synchronization with the shift clocks to control on/off timing of an ODT operation.