Adaptive Diode Sizing for Memory Power Leakage Reduction
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Solution Overview
Problem
In silicon memories, maintaining the data retention voltage (DRV) is challenging due to its variation with temperature and process variations, leading to increased power consumption when overcompensating for worst-case scenarios, which results in unnecessary power leakage.
Innovation Solution
Implementing an adaptive diode sizing technique that uses multiple diodes in parallel, with a control unit selecting the appropriate diode based on temperature and other factors to generate a supply voltage that tracks the data retention voltage, thereby minimizing power leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed supply voltage is provided for worst-case temperature scenarios, then data retention is ensured, but power consumption increases due to overcompensation
Solution Approach 1:
The patent implements dynamic voltage adjustment by selecting different diodes from a parallel set based on temperature conditions. The control unit monitors temperature and switches between diodes with different voltage drops to provide optimal supply voltage for SRAM cells under varying thermal conditions, preventing both overcompensation and data retention failures.
Solution Approach 2:
The invention changes the voltage parameter dynamically by using multiple diodes with different characteristics in parallel. Each diode provides a specific voltage drop, and the control unit selects the appropriate diode based on temperature, thereby adjusting the supply voltage parameter to match actual operating conditions rather than using a fixed worst-case value.
2Loss of energy
If multiple diodes are used in parallel with temperature-based selection, then power leakage is reduced, but device complexity increases
Solution Approach 1:
The patent segments the voltage regulation function by using multiple discrete diodes in parallel, each optimized for specific temperature ranges. The control unit divides the temperature operating range into segments and selects the appropriate diode for each segment, achieving fine-grained voltage control without requiring a complex continuous regulation system.
Solution Approach 2:
The invention uses multiple copies of the same basic diode component with different specifications (different voltage drops) to achieve varying voltage levels. This approach simplifies the overall design compared to using completely different circuit topologies, as it relies on replicating and configuring identical basic elements in parallel.
3Loss of energy
If the supply voltage is continuously adjusted to track data retention voltage, then power efficiency improves, but control complexity increases
Solution Approach 1:
The control unit periodically monitors temperature and switches between diodes based on temperature thresholds rather than continuously adjusting voltage. This periodic switching approach maintains power efficiency by keeping the voltage close to the data retention voltage while significantly reducing control complexity compared to continuous regulation.
Solution Approach 2:
The system uses the temperature condition itself as the control signal, eliminating the need for complex external control mechanisms. The control unit automatically selects the appropriate diode based on the measured temperature, allowing the system to self-regulate without requiring sophisticated external control systems or complex feedback loops.
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
This approach reduces power leakage by ensuring the supply voltage is optimized to match the data retention voltage, conserving power while maintaining data integrity across varying temperatures and processes.
Implementation Method 1
multiple diodes implemented in parallel... utilize a selected diode of the plurality of diodes to generate a supply voltage
Data Source
AI summary
Systems, apparatuses, and methods for reducing leakage current for a memory array. In various embodiments, techniques are implemented for generating a supply voltage for a memory array which tracks the data retention voltage of the memory array. In one embodiment, multiple diodes are implemented in parallel between a supply voltage and the memory array. The diodes have different sizes and different voltage drops, and the diode which will cause the voltage to drop closest to without going below the data retention voltage is selected for routing the supply voltage to the memory array. Since the data retention voltage for the memory array varies over temperature, the temperature of the system is monitored. Based on changes in the temperature, the system changes which diode is in the circuit path for supplying power to the memory array so as to reduce leakage current for the memory array.