On-Chip Supply Transient Scope for CPU Voltage Excursions
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Solution Overview
Problem
Integrated circuits face challenges in maintaining supply voltage parameters due to sudden changes in load current, which can lead to transient voltage excursions, making it difficult to determine the actual minimum supply voltage required for reliable operation, especially in complex devices like CPUs and GPUs, and there is a need for on-device monitoring without external instrumentation.
Innovation Solution
On-device monitoring and recording of supply voltage values by comparing them to multiple thresholds using a sensor array and storing results in memory, with logic circuitry to manage data retention and communication to a host processor for display purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external instrumentation like a scope is connected to monitor supply voltage, then measurement capability is improved, but device enclosure integrity is compromised and portability is reduced
Solution Approach 1:
The patent extracts the voltage monitoring function from external instrumentation and implements it internally within the integrated circuit. A voltage sensor array and comparator circuit are integrated on-chip to monitor supply voltage, eliminating the need for external scope connections while maintaining measurement capability.
Solution Approach 2:
The monitoring system is nested within the existing IC structure. The voltage sensor array, comparators, and memory elements are all integrated within the same chip or module, creating a self-contained monitoring system that does not compromise device enclosure.
2Measurement precision
If sampling rate is increased to capture fast transient occurrences, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic sampling at the clock rate of the integrated circuit rather than continuous high-rate sampling. The comparator circuit samples voltage at discrete clock cycles, achieving adequate transient capture while significantly reducing power consumption compared to continuous high-speed sampling.
Solution Approach 2:
The monitoring system leverages the existing clock signal and power infrastructure of the integrated circuit. The comparator is clocked by the IC's own clock, and the system monitors its own supply voltage without requiring separate high-power sampling infrastructure.
3Reliability
If margin is increased between expected minimum supply voltage and reliable operation voltage, then reliability is improved, but power efficiency deteriorates
Solution Approach 1:
The patent implements feedback monitoring where the actual supply voltage is continuously compared against threshold values. When voltage approaches the minimum reliable operation level, the system can trigger corrective actions such as reducing clock frequency or activating power management modes, allowing operation closer to minimum voltage thresholds while maintaining reliability.
Solution Approach 2:
The monitoring system detects voltage drops before they reach critical levels that would cause logic errors. By providing early warning through the comparator circuit, the system can take preventive measures such as reducing power consumption or activating backup power sources before reliability is compromised.
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
Enables effective monitoring and recording of supply voltage transients within integrated circuits, ensuring reliable operation by identifying voltage deviations and providing insights into power management, thus extending battery life and preventing incorrect logic operations.
Implementation Method 1
a sensor array configured to receive a signal indicative of the supply voltage provided to the load, to compare the signal indicative of the supply voltage to each of a plurality of reference voltages
Data Source
AI summary
Temporal history of voltage supply level enveloping high-speed transient events is provided by circuitry on the same chip or in the same multi-chip module as the processor cores. In some embodiments supply voltage to the processor cores is compared to predetermined or programmable thresholds, and the result of the comparisons are stored for use by a host processor.