On-Die Voltage Droop Detector Using Resistance Ladder Circuit
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Solution Overview
Problem
Integrated circuits face challenges in accurately detecting voltage droops caused by sudden increases in current consumption, leading to decreased precision and increased complexity in existing detection methods such as delay-chain based TDCs and voltage controlled calibration devices, which are sensitive to process and temperature variations.
Innovation Solution
A variation immune on-die droop detector system using a voltage calibrator and comparator components, employing a resistance ladder circuit to convert supply voltage and generate a comparison output signal based on a reference voltage, providing a fixed reference voltage with programmable offsets and reducing sensitivity to process and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If delay-chain based TDC or voltage controlled calibration devices are used for voltage droop detection, then detection capability is provided, but measurement precision deteriorates due to sensitivity to process and temperature variations
Solution Approach 1:
The patent introduces a resistance ladder circuit as an intermediary element that converts the supply voltage into a scaled-down voltage proportional to the original. This intermediary conversion allows the comparator to detect voltage droops indirectly through a scaled version, reducing the impact of process and temperature variations on measurement precision. The resistance ladder acts as a buffer that isolates the detection mechanism from direct exposure to environmental variations.
Solution Approach 2:
The patent changes the voltage parameter by scaling it down through the resistance ladder circuit before comparison. By transforming the original supply voltage into a proportionally reduced voltage, the system can perform comparisons with a reference voltage that is also scaled, thereby reducing the absolute impact of process and temperature variations on the detection threshold and improving overall measurement precision.
2Measurement precision
If complex detection methods are used to improve detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent segments the voltage droop detection function into three distinct modular components: a resistance ladder circuit for voltage scaling, a comparator for voltage comparison, and a sampling component for signal capture. This segmentation allows each component to perform its specific function with simple circuitry, avoiding the need for a single complex detection mechanism while achieving high measurement precision through the coordinated operation of simpler parts.
Solution Approach 2:
The resistance ladder circuit serves as a simple intermediary that performs the complex task of voltage scaling without requiring sophisticated circuitry. This intermediary element bridges the gap between the raw supply voltage and the comparator, enabling accurate droop detection through a straightforward resistive division approach rather than complex active circuitry.
3Device complexity
If on-die detection system is used, then resource overhead is reduced and latency is lowered, but noise may increase
Solution Approach 1:
The patent extracts the essential voltage droop detection function from the main processor logic and implements it as a separate, dedicated on-die module. By taking out this specific function and isolating it in its own circuit block, the system reduces resource overhead by avoiding duplication of detection logic across multiple components while managing noise through spatial separation from other noisy digital circuits on the die.
Solution Approach 2:
The on-die detection system is self-sufficient, generating its own comparison output signal and droop detection signal without requiring external detection hardware. The sampling component automatically captures the comparison output at appropriate clock edges, and the system self-manages the detection process entirely within the integrated circuit, reducing the need for additional external resources while maintaining low latency through direct integration with the power distribution network monitoring points.
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
The system improves the detection and determination of voltage droops with enhanced precision and reduced complexity, enabling dynamic voltage and frequency scaling, and reduces noise and resource overhead by being located on-die, allowing for low latency and effective voltage droop control.
Implementation Method 1
converting a first supply voltage associated with a power distribution network of an integrated circuit to a second supply voltage via a resistance ladder circuit
Data Source
AI summary
Various aspects provide for detecting voltage droops. For example, a system can include a voltage calibrator component and a comparator component. The voltage calibrator component can convert a first supply voltage associated with a power distribution network of an integrated circuit to a second supply voltage via a resistance ladder circuit. The comparator component can generate a comparison output signal in response to a determination that a comparison between the second supply voltage and a reference voltage satisfies a defined criterion.