Power Rail Tracking Voltage Regulator for Stable Multi-Domain Supply
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Solution Overview
Problem
Integrated circuits with multiple power domains face performance degradation due to parasitic resistances in metal rails, leading to voltage variations that affect the operation of functional circuits.
Innovation Solution
A voltage regulator is employed to sense voltage changes at one point of a metal rail and adjust the supply voltage at another point through transistors, using negative feedback loops and transconductance adjustments to stabilize voltages across the rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple power domains are used to improve circuit efficiency and performance, then power consumption and speed are optimized, but parasitic resistances in metal rails cause voltage variations that degrade operation stability
Solution Approach 1:
The patent implements a feedback mechanism where the voltage regulator continuously monitors the voltage at the second point of the metal rail and adjusts the supply voltage at the first point accordingly. This closed-loop control compensates for voltage drops caused by parasitic resistances, maintaining stable operation across different power domains while preserving circuit efficiency.
Solution Approach 2:
The voltage regulator acts as an intermediary device between the power source and the functional circuits. It senses voltage changes at one point of the metal rail and adjusts the supply voltage at another point, effectively mediating the voltage variations caused by parasitic resistances and ensuring stable power delivery to circuits operating in different power domains.
2Reliability
If voltage regulator adjusts supply voltage to compensate for parasitic resistances, then voltage stability is improved, but device complexity increases due to additional components and control circuits
Solution Approach 1:
The voltage regulator employs a self-service mechanism where it automatically senses voltage changes at the second point of the metal rail and autonomously adjusts the supply voltage at the first point without external intervention. This self-regulating capability maintains voltage stability while minimizing the need for additional complex control circuits and external adjustment mechanisms.
Data Source
AI summary
Disclosed herein are related to an integrated circuit to regulate a supply voltage. In one aspect, the integrated circuit includes a metal rail including a first point, at which a first functional circuit is connected, and a second point, at which a second functional circuit is connected. In one aspect, the integrate circuit includes a voltage regulator coupled between the first point of the metal rail and the second point of the metal rail. In one aspect, the voltage regulator senses a voltage at the second point of the metal rail and adjusts a supply voltage at the first point of the metal rail, according to the sensed voltage at the second point of the metal rail.