Local Feedback Voltage Regulation for Package Voltage Drop Compensation
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Solution Overview
Problem
In modern computer systems, voltage regulator circuits often face challenges in maintaining desired voltage levels due to voltage drops caused by non-ideal characteristics of traces and package pins, especially when located on separate integrated circuits from the load circuits, leading to suboptimal performance of load circuits.
Innovation Solution
A voltage regulator circuit is configured to generate a regulated power supply node using a feedback node with a power distribution network, where power switches selectively couple the package power supply node or local power supply nodes to the feedback node, allowing the voltage regulator to compensate for voltage drops by sampling the voltage level close to the load circuit, thereby maintaining a stable voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage regulator circuit is located on a separate integrated circuit from the load circuits, then the regulator can provide stable voltage generation, but voltage drops occur due to parasitic elements in the power distribution network
Solution Approach 1:
The patent implements a feedback mechanism where the voltage level at the local power supply node (after the power distribution network) is sampled and fed back to the voltage regulator circuit. This feedback signal allows the regulator to detect voltage drops caused by parasitic elements and adjust its output accordingly, compensating for the losses in the power distribution network while maintaining stable voltage generation.
Solution Approach 2:
The patent introduces an intermediary feedback path that connects the local power supply node (at the load side) back to the voltage regulator circuit. This intermediary mechanism enables the regulator to indirectly sense the actual voltage delivered to the load and make precise adjustments, resolving the contradiction between physical separation for stability and voltage drop prevention.
2Adaptability or versatility
If multiple local power supply nodes are used to serve different load circuits, then power distribution flexibility is improved, but voltage variations across different nodes become difficult to manage
Solution Approach 1:
The patent segments the feedback mechanism to work with multiple local power supply nodes. Each local node can be independently monitored and controlled through the feedback system, allowing the voltage regulator circuit to manage voltage levels at each node separately. This segmentation enables flexible power distribution to different load circuits while maintaining voltage consistency through individualized control of each node.
Data Source
AI summary
A voltage regulator circuit may generate a regulated voltage level using a voltage level of a feedback node. The regulated voltage level may be distributed, via a power distribution network, to package power supply node of a package, into which an integrated circuit has been mounted. Power switches included in the integrated circuit may couple the package power supply node to respective local power supply nodes in the integrated circuit. A particular power switch may selectively couple different ones of the local power supply nodes to the feedback node, allowing the voltage regulator circuit to compensate for reductions in the regulated voltage level due to the power distribution network, as well as adjust the regulated voltage level based on power consumptions of load circuits coupled to the local power supply nodes.