Distributed Voltage Sensors for IC Supply Monitoring
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Solution Overview
Problem
Integrated circuits face challenges in accurately detecting supply voltage variations, particularly in high cell density areas, due to large, inaccurate sensors that increase power and area requirements, and traditional testing methods fail to replicate real-world voltage droop conditions.
Innovation Solution
A distributed network of small, potentially inaccurate voltage sensors with random voltage offsets is used across the integrated circuit, with results combined to reduce offset ranges and achieve accurate voltage level measurements, enabling adaptive margin introduction and voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large, accurate voltage sensors are used to detect supply voltage variations, then measurement precision is improved, but area requirements and power consumption increase
Solution Approach 1:
The patent divides the monitoring function into multiple small sensor units distributed across the integrated circuit. Each sensor is intentionally made small with inherent process variations, but collectively they provide accurate voltage detection through statistical aggregation. This segmentation allows accurate measurement without requiring large individual sensor areas.
Solution Approach 2:
The patent changes the approach from using few large accurate sensors to using many small sensors with random offsets. By changing the parameter of sensor size from large to small and compensating through numerical aggregation, the system achieves accurate voltage detection while minimizing area occupation.
2Area of stationary object
If multiple small sensors with random voltage offsets are used, then area requirements are reduced, but individual sensor accuracy deteriorates
Solution Approach 1:
The patent merges the outputs of multiple small sensors with random voltage offsets to achieve accurate voltage detection. By combining the measurements from N sensors and applying statistical analysis, the random offsets cancel out, yielding an accurate determination of supply voltage variations despite individual sensor inaccuracy.
Solution Approach 2:
The system uses feedback by comparing sensor outputs against a reference voltage and using the collective statistical behavior of multiple sensors to determine actual voltage levels. The random offsets are compensated through feedback mechanisms that aggregate results from all sensors to determine the true voltage state.
3Ease of manufacture
If traditional testing methods are used, then test implementation is simplified, but ability to detect real voltage droop conditions deteriorates
Solution Approach 1:
The patent implements local voltage sensing at multiple distributed points across the integrated circuit rather than using a single global reference. This local quality approach allows detection of localized voltage droops that traditional methods miss, as each sensor monitors its local region's voltage conditions independently.
Data Source
AI summary
An integrated circuit including a plurality of sensors configured to sense variations in supply voltage levels at points within the integrated circuit is disclosed. The plurality of sensors are distributed across the integrated circuit and have transistor devices such that process variations in the transistor devices within the sensors are such that a sensing result will have a random voltage offset that has a predetermined probability of lying within a pre-defined voltage offset range. The integrated circuit is configured to transmit results from multiple ones of the plurality of sensors to processing circuitry such that the variations in the supply voltage levels can be determined with a voltage offset range that is reduced compared to the pre-defined voltage offset range.