Supply Voltage Ringing Detection with Adaptive Clock Timing
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Solution Overview
Problem
Computing devices, especially mobile devices, face issues with supply voltage undershoot and ringing due to high current loads, leading to potential equipment damage and computing errors, which existing technologies fail to adequately address.
Innovation Solution
The implementation of sensor circuitry and control circuitry that detect supply voltage events, such as load steps or releases, and perform corrective actions like adjusting clock cycle time or frequency to mitigate voltage transients, using a combination of sensors like high-pass filters, low-pass filters, and voltage-controlled oscillators to manage supply voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current loads are used to improve processing power, then productivity is improved, but supply voltage undershoot and ringing occur causing reliability to deteriorate
Solution Approach 1:
The sensor circuitry detects supply voltage events (undershoot, ringing, load release events) in advance or concurrently with the voltage disturbances, allowing the control circuitry to initiate corrective actions before logic timing failures occur. The system monitors voltage conditions and proactively adjusts clock cycle times to prevent failures rather than reacting after damage occurs.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where sensor circuitry continuously monitors supply voltage conditions and feeds this information to control circuitry. Based on the detected voltage events, the control circuitry dynamically adjusts clock cycle times to maintain reliable operation despite voltage fluctuations caused by high current loads.
2Use of energy by moving object
If voltage margins are reduced to improve power efficiency, then use of energy is improved, but susceptibility to voltage transients increases causing reliability to deteriorate
Solution Approach 1:
The system dynamically adjusts clock cycle times based on real-time supply voltage conditions rather than using fixed timing margins. When voltage transients are detected, the control circuitry extends clock cycle times adaptively, allowing the system to maintain reliability with reduced static voltage margins while consuming less power during normal operation.
3Speed
If clock frequency is increased to improve processing speed, then speed is improved, but sensitivity to supply voltage droop increases causing logic timing failures
Solution Approach 1:
The sensor circuitry detects supply voltage events in advance or concurrently with voltage disturbances, allowing the control circuitry to extend clock cycle times before logic timing failures occur. This proactive timing adjustment prevents failures caused by high-frequency operation during voltage transients.
4Adaptability or versatility
If load release events are allowed to occur naturally to improve responsiveness, then adaptability is improved, but transient voltage spikes cause subsequent ringing and undershoot deteriorating reliability
Solution Approach 1:
The sensor circuitry monitors supply voltage conditions following load release events and provides feedback to the control circuitry. When transient voltage spikes or subsequent ringing are detected, the system dynamically adjusts clock cycle times to maintain reliable operation, allowing natural load responsiveness while compensating for the resulting voltage instability.
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 supply voltage transients, avoids equipment damage, and allows for reduced voltage margins, thereby improving the stability and power efficiency of computing devices.
Implementation Method 1
a sensor includes a replica of voltage-controlled oscillator (VCO) delay stages (e.g., where the VCO has a separate power supply and the replica is powered by the supply voltage being measured) and is configured to measure phase differences between the VCO and the replica to detect changes in the supply voltage
Implementation Method 2
a programmable sensor complex includes one or more high-pass filters, one or more low-pass filters, and one or more programmable level-sense elements
Data Source
AI summary
Techniques are disclosed relating to detecting supply voltage events and performing corrective actions. In some embodiments, an apparatus includes sensor circuitry and control circuitry. In some embodiments, the sensor circuitry is configured to monitor supply voltage from a power supply and detect a load release event that includes an increase in the supply voltage that meets one or more pre-determined threshold parameters. In some embodiments, the control circuitry is configured to increase clock cycle time for operations performed by circuitry powered by the supply voltage during a time interval, wherein the time interval corresponds to ringing of the supply voltage that reduces the supply voltage and results from the load release event. In some embodiments, the disclosed techniques may reduce transients in supply voltage (which may avoid equipment damage and computing errors) and may allow for reduced voltage margins (which may reduce overall power consumption).