Voltage Sense Line Selection Circuit for Power Delivery
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Solution Overview
Problem
Voltage regulation systems face challenges in maintaining a consistent voltage level across multiple power nodes, particularly in systems with fluctuating power consumption, leading to voltage droops that can impact circuit performance.
Innovation Solution
A power delivery system that includes a voltage regulator and a sensing circuit capable of performing sequential comparisons of voltage levels across multiple voltage sense signals to identify the worst-case voltage level, using this information to generate a feedback signal for adjusting the regulated voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single voltage sense signal is used for feedback, then the device complexity is reduced, but the voltage regulation precision deteriorates because it cannot account for voltage variations across multiple power nodes
Solution Approach 1:
The sensing circuit is divided into multiple sensing stages, with each stage responsible for comparing a specific pair of voltage sense signals. This segmentation allows the system to monitor multiple power nodes independently while maintaining manageable circuit complexity at each stage.
Solution Approach 2:
The patent transitions from single-dimension voltage monitoring (one sense signal) to multi-dimension monitoring by introducing multiple sensing stages that compare different pairs of voltage signals sequentially, adding temporal and spatial dimensions to the voltage regulation feedback process.
2Measurement precision
If multiple voltage sense signals are monitored simultaneously with full comparison, then the voltage regulation precision is improved, but the device complexity and power consumption increase significantly
Solution Approach 1:
The sensing circuit performs voltage comparisons in periodic sequential stages rather than simultaneously. Each stage activates in turn to compare specific voltage sense signals, reducing the number of active comparators at any given moment while still achieving comprehensive monitoring of all power nodes.
Solution Approach 2:
Instead of implementing all possible pairwise comparisons among multiple voltage sense signals (excessive action), the patent uses a minimal set of sequential comparisons that suffice to identify the minimum voltage level (partial action), optimizing the balance between monitoring coverage and circuit complexity.
3Reliability
If a simple voltage regulation system is used, then the device complexity is reduced, but the reliability deteriorates due to inability to compensate for voltage droops under varying power consumption
Solution Approach 1:
The patent implements a feedback mechanism where the output of the sequential comparison stages feeds back to the voltage regulator. This feedback loop enables the system to dynamically adjust the voltage supply based on actual voltage conditions at multiple power nodes, improving reliability while maintaining controlled complexity through the structured feedback path.
Solution Approach 2:
The voltage regulation system uses its own internal voltage sense signals to generate the feedback information needed for regulation. Each power node's voltage condition is self-monitored through dedicated sense signals, and the system autonomously identifies and responds to voltage droops without external intervention.
4Reliability
If excessive operating margins are used to prevent voltage drops, then the reliability is improved, but the power consumption and energy efficiency worsen
Solution Approach 1:
The voltage regulation system dynamically adjusts the operating voltage based on real-time conditions at power nodes. Instead of maintaining a static high voltage to ensure reliability (excessive margin), the system adaptively sets voltage levels according to actual power consumption patterns and load conditions, optimizing the balance between reliability and energy efficiency.
Data Source
AI summary
An embodiment includes a circuit block configured to distribute a power signal to a plurality of voltage sense signals, and a voltage regulator configured to generate a regulated voltage level on the power signal. The embodiment also includes a sensing circuit configured to perform a sequence of comparisons of respective voltage levels of the plurality of voltage sense signals using a selection criterion. To perform the sequence of comparisons, the sensing circuit may be configured to select either a first voltage sense signal or a second voltage sense signal to generate a first output voltage sense signal. The sensing circuit may also be configured to select either a third voltage sense signal or a previously generated output voltage sense signal to generate a feedback signal. The voltage regulator circuit may be further configured to modify the regulated voltage level using the feedback signal.