Power-Gated Circuit Sections for Voltage Droop Control
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Solution Overview
Problem
As circuits scale down into the deep nanometer range, power leakage increases, making it challenging to reduce power consumption and extend battery life in mobile devices, particularly due to significant voltage droop when power-gated circuits are activated, which can cause logic malfunctions in upstream circuits.
Innovation Solution
The method involves dividing downstream circuits into sections of progressively increasing size, determining their capacitances based on upstream capacitance and voltage-droop constraints, and sequentially powering them up to minimize voltage droop while optimizing wakeup time, using a power management device with switches to control power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power-gated circuits are activated to reduce power consumption, then power leakage is reduced, but voltage droop increases causing logic malfunctions
Solution Approach 1:
The downstream circuit is divided into multiple power-gated sections with progressively increasing capacitance values. Each section can be independently powered on or off, allowing the system to reduce power consumption by gating individual sections while limiting voltage droop by controlling which sections are active. The segmentation of the circuit into capacitively-balanced sections resolves the contradiction between power savings and voltage stability.
2Reliability
If more sections are powered up to reduce voltage droop, then voltage stability improves, but wakeup time increases
Solution Approach 1:
The sections are designed with progressively increasing capacitance values, where later sections have higher capacitance than earlier ones. This parameter variation allows the system to power up sections in an optimized sequence that balances voltage droop compensation with wakeup time reduction. The changing capacitance parameter enables faster charging of subsequent sections while maintaining voltage stability.
3Ease of manufacture
If sections are sized equally to simplify design, then manufacturing complexity is reduced, but voltage droop control precision decreases
Solution Approach 1:
Different sections of the downstream circuit are assigned different capacitance values based on their position in the power-up sequence. Earlier sections have smaller capacitance while later sections have progressively larger capacitance. This local variation in capacitance quality allows precise control of voltage droop at each stage of power-up, optimizing both voltage stability and wakeup time while maintaining manageable design complexity.
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
This approach reduces the number of sections that need to be powered up, thereby decreasing the wakeup time of downstream circuits while maintaining acceptable voltage droop levels, thus enhancing power conservation and preventing logic malfunctions.
Implementation Method 1
determining a capacitance for a first section based on a capacitance of an upstream circuit, and a voltage-droop constraint, determining a capacitance for a second section based on the capacitance of the upstream circuit, the voltage-droop constraint, and the determined capacitance for the first section
Data Source
AI summary
A method for powering up a circuit comprising a plurality of sections of progressively increasing size is described. The method comprises receiving a signal for powering up the circuit, and, in response to the signal, sequentially powering up the plurality of sections in an order of increasing size.