Temperature Detection Circuit for Semiconductor Memory Power Optimization
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Solution Overview
Problem
Semiconductor memory apparatuses face challenges in reducing power consumption during refresh operations, necessitating a temperature detection circuit to vary the repetition period based on temperature variations.
Innovation Solution
A temperature detection circuit comprising a fixed period oscillator, a temperature variable signal generating unit, and a counting unit that generates a temperature information signal by varying the enable interval and counting oscillator signals, allowing for efficient detection of temperature variations and adjustment of refresh operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refresh operation is performed periodically to maintain capacitor voltage levels, then data retention is improved, but power consumption increases
Solution Approach 1:
The refresh operation period is made dynamic rather than fixed. The repetition period of the refresh operation is varied based on temperature variations detected by the temperature detection circuit. At higher temperatures, the refresh period is shortened to ensure data retention, while at lower temperatures, the period is extended to reduce power consumption. This dynamic adjustment resolves the contradiction between maintaining reliable data retention and reducing power consumption.
Solution Approach 2:
The key parameter being changed is the refresh operation period, which is adjusted according to temperature conditions. The temperature detection circuit monitors temperature variations and provides feedback to modify the refresh period parameter. This parameter change strategy allows the system to optimize the balance between data retention reliability and power consumption by adapting the refresh frequency to actual thermal conditions within the semiconductor memory apparatus.
2Use of energy by moving object
If a temperature detection circuit is added to vary refresh operation period based on temperature, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The temperature detection circuit is integrated within the semiconductor memory apparatus itself, merging the temperature sensing function with the existing memory structure. Rather than adding a completely separate external temperature sensor, the detection circuit is incorporated into the memory device, sharing resources and reducing overall system complexity. This merging approach allows power consumption reduction through temperature-based refresh optimization while minimizing the increase in device complexity.
Solution Approach 2:
The semiconductor memory apparatus performs self-monitoring of its internal temperature conditions through the integrated temperature detection circuit. The system uses its own internal resources to detect temperature variations and automatically adjusts its refresh operation parameters accordingly. This self-service capability eliminates the need for external temperature sensors and control systems, reducing overall device complexity while achieving power consumption reduction through adaptive refresh operations.
Data Source
AI summary
A temperature detection circuit of a semiconductor memory apparatus includes a fixed period oscillator, a temperature variable signal generating unit and a counting unit. The oscillator is configured to generate a fixed period oscillator signal when an enable signal is enabled. The temperature variable signal generating unit is configured to generate a temperature variable signal whose enable interval varies based on temperature variations, when the enable signal is enabled. The counting unit is configured to count the oscillator signal during the enable interval of the temperature variable signal to generate a temperature information signal.