3D IC TSV Temperature Sensing for Adaptive Memory Refresh
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Solution Overview
Problem
3D ICs face challenges in managing heat flow and temperature sensitivity, particularly affecting memory operations, which are prone to data loss due to inadequate heat dissipation and temperature adjustments.
Innovation Solution
A 3D IC design incorporating a temperature sensor near a through silicon via (TSV) structure to monitor temperature changes, allowing for advanced adjustments in refresh periods or frequencies of memory arrays to prevent data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory operations are performed in 3D IC without temperature monitoring, then device complexity is reduced, but data loss occurs due to temperature sensitivity
Solution Approach 1:
The temperature sensor is integrated within the memory chip structure itself, merging the temperature monitoring function with the existing memory device. This eliminates the need for separate external temperature sensing systems, thereby improving reliability through continuous monitoring while avoiding excessive complexity increase.
Solution Approach 2:
The temperature sensor acts as an intermediary element that detects temperature changes caused by TSV heating and triggers refresh operations. This mediator enables the system to respond to thermal effects without requiring complex real-time temperature control, maintaining data integrity through proactive refresh based on temperature sensing.
2Reliability
If refresh frequency is increased to prevent data loss, then data retention is improved, but energy consumption increases
Solution Approach 1:
The refresh frequency is dynamically adjusted based on real-time temperature sensing results. When the temperature sensor detects elevated temperatures near TSV structures, the system increases refresh frequency to prevent data loss. When temperatures are normal, refresh operations return to standard frequencies, optimizing energy consumption while maintaining reliability.
Solution Approach 2:
The system changes the operational parameter (refresh frequency) in response to temperature conditions. By monitoring temperature and adaptively modifying refresh rates, the system ensures data retention during thermal stress while minimizing unnecessary energy consumption during normal operating conditions.
3Measurement precision
If temperature sensor is placed远离 TSV structure, then manufacturing is easier, but temperature sensing accuracy decreases
Solution Approach 1:
The temperature sensor is strategically positioned in close proximity to the TSV structure where temperature changes are most significant. This localized placement ensures high measurement precision for detecting thermal effects without requiring complex manufacturing processes, as the sensor is integrated into the existing memory chip layout.
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
Accurate temperature sensing enables proactive adjustments in memory operations, effectively preventing data loss by anticipating and responding to temperature fluctuations.
Implementation Method 1
The temperature sensor is disposed close to the TSV structure, and is configure to sense a temperature sensing result corresponding to a temperature of the TSV structure
Data Source
AI summary
A 3-dimensional (3D) integrated circuit (IC) is provided. The 3D IC includes a plurality of chips, at least one through silicon via (TSV) structure, and a temperature sensor. The chips are stacked in the 3D IC. The TSV structure penetrates the chips. The temperature sensor is disposed in a first chip of the chips. The temperature sensor is disposed close to the TSV structure, and is configure to sense a temperature sensing result corresponding to a temperature of the TSV structure.