On-Chip Power Grid Voltage Drop Mapping via Ring Oscillator Taps
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Solution Overview
Problem
Integrated circuits face significant voltage (IR) drops and short circuits due to varying distances from power grid tap-points to circuits, which are not effectively detected by existing methods.
Innovation Solution
A voltage drop detection circuitry using a multiplexer and ring oscillator system measures tap-point frequencies to create a voltage map and detect short circuits, allowing for precise identification of voltage drops and shorts within the power grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional voltage detection methods are used, then the detection approach is simple, but voltage drops and short circuits cannot be effectively detected
Solution Approach 1:
The patent introduces an intermediary detection circuit that includes a multiplexer and ring oscillator. This intermediary system converts voltage drop measurements into frequency signals, which can then be processed to identify voltage anomalies. The multiplexer acts as a mediator to select different tap points, and the ring oscillator converts voltage differences into measurable frequency changes, enabling effective detection without direct complex measurement.
Solution Approach 2:
The patent replaces traditional direct voltage measurement methods with a frequency-based detection mechanism. By using a ring oscillator whose frequency changes with voltage drops, the system substitutes direct electrical measurement with a frequency measurement approach, which can be more effectively processed and interpreted to detect voltage anomalies and short circuits.
2Reliability
If voltage drop detection is implemented, then short circuits can be detected, but the system complexity increases
Solution Approach 1:
The detection circuit is designed with multi-functionality to address both voltage drop mapping and short circuit detection. The same multiplexer and ring oscillator system serves dual purposes: mapping voltage drops across different tap points and detecting short circuits by identifying abnormal frequency changes. This universal approach reduces the need for separate dedicated circuits for each function.
Solution Approach 2:
The patent segments the power grid into multiple tap points that can be individually selected and measured. By dividing the detection task into discrete tap point measurements, the system can systematically map voltage drops across the entire power grid and identify specific locations of voltage anomalies or short circuits, making the detection process more manageable and systematic.
3Measurement precision
If tap point frequency measurement is used, then voltage drop mapping is achieved, but measurement precision requirements increase
Solution Approach 1:
The patent changes the measurement parameter from direct voltage measurement to frequency measurement. By using a ring oscillator whose frequency varies with voltage drops, the system transforms voltage measurements into frequency measurements. This parameter change enables more precise voltage drop mapping because frequency can be measured with high precision and the relationship between frequency and voltage can be calibrated and standardized.
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 provides accurate voltage drop mapping and short circuit detection, enabling chip designers to address issues proactively and improve circuit design, reducing the risk of failures.
Implementation Method 1
voltage drop detection circuitry provides data representing a frequency corresponding to the selected plurality of tap points
Data Source
AI summary
An integrated circuit includes at least one on-chip power conductor network, also referred to as a power grid, configured to distribute electrical power to a plurality of electrical components on the integrated circuit. Voltage drop detection circuitry selects each of a plurality of tap points from the on-chip power conductor network and in response to a plurality of selected tap points, provides data representing a frequency corresponding to a voltage level of each of the selected plurality of tap points. The data is used in some implementations to detect a short circuit in the power grid and in other implementations is used to generate a voltage drop map that identifies the locations in the power grid where power drops are beyond a desired threshold.