Digital Voltage Sensor Delay Line for Predicting CPU Voltage Droop
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Solution Overview
Problem
Existing voltage sensor circuits struggle to predict voltage droop in processing unit critical paths with sufficient accuracy, leading to potential timing violations and incorrect data processing.
Innovation Solution
A digital voltage sensor circuit with a delay line configuration, utilizing digital gates with a second voltage threshold greater than the critical path's first voltage threshold, to predict voltage droop by detecting changes in voltage with increased sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage sensor circuit uses digital gates with the same voltage threshold as the critical path, then the circuit complexity is low, but the measurement precision of voltage droop is insufficient
Solution Approach 1:
The patent applies local quality by using digital gates with different voltage thresholds (first voltage threshold for critical path gates, second voltage threshold for sensor gates) in different parts of the circuit. This differentiation allows the sensor portion to have enhanced voltage sensitivity while the critical path maintains its original performance characteristics, thereby improving measurement precision without uniformly increasing complexity throughout the entire system.
Solution Approach 2:
The delay line circuit acts as an intermediary between the voltage droop phenomenon and the detection mechanism. By introducing this intermediate structure with gates having higher voltage thresholds, the circuit translates subtle voltage changes into measurable timing differences, effectively bridging the gap between the physical voltage droop and the digital detection system, thus improving measurement precision.
2Measurement precision
If the voltage sensor uses higher voltage threshold gates, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent segments the voltage sensing function into a separate delay line circuit with distinct gates having higher voltage thresholds. This segmentation isolates the high-precision measurement function from the critical path, allowing enhanced voltage change sensitivity in the sensor portion while keeping the critical path unchanged, thereby improving measurement precision without proportionally increasing overall system complexity.
Solution Approach 2:
The delay line circuit creates a simplified copy of the critical path's logical function using gates with higher voltage thresholds. This copy is specifically designed for voltage sensing purposes, replicating the essential timing characteristics while being optimized for sensitivity to voltage droop, thus improving measurement precision with controlled additional complexity.
3Reliability
If voltage droop is not predicted accurately, then the device operation is simple, but timing violations occur leading to incorrect data processing
Solution Approach 1:
The patent implements preliminary action by using the delay line circuit to predict voltage droop before it causes timing violations in the critical path. The sensor circuit proactively measures voltage changes and can trigger preventive actions (such as clock frequency relaxation) before timing violations occur, thereby improving reliability by preventing errors rather than correcting them after they happen.
Solution Approach 2:
The voltage sensor circuit establishes a feedback mechanism that continuously monitors voltage droop in the critical path and provides information about voltage conditions. This feedback enables the system to adjust operating parameters proactively, improving timing reliability by maintaining awareness of voltage conditions and taking corrective actions before timing violations occur.
Data Source
AI summary
According to one implementation, a computer system includes processing unit circuitry of one or more computer devices that include a plurality of transistors configured to a first voltage threshold, and digital voltage sensor circuitry (160) of the one or more computer devices that include at least a delay line circuit (126) including one or more digital gates (120A-N). Each of the one or more digital gates (120A-N) includes driving transistors configured to a second voltage threshold, where the digital voltage sensor circuit (160) is configured to predict voltage droop of the processing unit circuitry.