Dynamic Decoupling Capacitor for Power Rail Voltage Droop
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Solution Overview
Problem
Conventional decoupling capacitors are constrained by voltage droop requirements, consume significant space, introduce instability, and fail to address timing loss in high-speed logic circuits, while active-decoupling solutions require additional components and lack visibility into internal circuit activities.
Innovation Solution
A dynamic decoupling capacitor system integrated at the gate or cell level, scalable with logic circuitry, matches total charge of injected and load currents, and operates in charging and discharging phases to stabilize power rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional passive decoupling capacitors are used to mitigate voltage droop, then voltage stability is improved, but area consumption increases and instability issues are introduced
Solution Approach 1:
The patent implements a dynamic decoupling capacitor that can switch between charged and discharged states based on real-time power rail conditions. This dynamic behavior allows the capacitor to provide current during voltage droop events without requiring large capacitance values, thereby reducing area consumption while maintaining voltage stability.
Solution Approach 2:
The patent changes the operational parameters of the decoupling capacitor by introducing controlled charging and discharging phases. During normal operation, the capacitor is charged; during voltage droop events, it discharges to provide current. This parameter change enables effective voltage regulation with smaller capacitor sizes.
2Area of stationary object
If analog-based active-decoupling capacitor is used to reduce area, then area consumption is reduced, but response speed decreases
Solution Approach 1:
The patent pre-charges the dynamic decoupling capacitor during idle periods or when power rail voltage is stable. This preliminary action ensures that when a voltage droop event occurs, the capacitor is already charged and can immediately discharge to provide current, achieving fast response speed without requiring large area.
3Reliability
If power rail is separated for burst-idle-burst components to address voltage droop, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the decoupling function with the existing power rail structure by integrating a dynamic decoupling capacitor into the power distribution network. This approach maintains a unified power rail architecture while providing targeted voltage regulation, avoiding the complexity of separated power rails and additional routing resources.
4Reliability
If prior art solution with droop prediction circuit is implemented, then voltage stability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements a self-service mechanism where the dynamic decoupling capacitor automatically responds to voltage droop events based on its integration with the power rail. The capacitor's discharge behavior is inherently linked to the power rail conditions, eliminating the need for separate droop prediction and detection circuits, thereby reducing device complexity and power consumption.
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
The system provides high-speed responsiveness, reduces area occupancy, and minimizes voltage fluctuations, enabling stable power supply and reduced timing loss in high-speed logic circuits.
Implementation Method 1
a dynamic decoupling capacitor (10), particularly addressing the challenges posed by a high-speed logic circuit with burst-idle-burst activity characteristics
Data Source
AI summary
The present invention relates to a circuitry system (1). The circuitry system (1) comprises a reservoir power rail (12), a regulated power rail (14), a logic circuitry (18) connected to the regulated power rail (14), wherein each of the reservoir power rail (12), regulated power rail (14) and logic circuitry (18) is connected to respective voltage supply source (16), characterized by a dynamic decoupling capacitor (10) connecting the reservoir power rail (12) to the regulated power rail (14), and in communication with the logic circuitry (18), wherein the dynamic decoupling capacitor (10) is configured to match a total-charge of injected-current, ldecap, from the reservoir power rail (12) with a total-charge of load-current, lload, supplying to the logic circuitry (18). A method for regulating voltage of the circuitry system (1) is also disclosed herein.