Asynchronous Transient Response Accelerator for Voltage Droop
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Solution Overview
Problem
Voltage regulators in portable computing devices experience unacceptable voltage droop due to sharp steps in load current, leading to supply voltage levels falling below minimum required levels for circuit operation.
Innovation Solution
An apparatus and method utilizing an asynchronous transient response accelerator (ATRA) with multiple current sources and a control circuit that responds to detection signals, including a delayed version, to quickly ramp up current and stabilize the output voltage, reducing voltage droop and preventing digital circuits from crashing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a voltage regulator is used to regulate voltage, then voltage stability is improved, but voltage droop occurs due to sharp load current steps
Solution Approach 1:
The detection circuit monitors the output voltage and detects drops before they become critical. The control circuit activates current sources in advance to compensate for upcoming load changes, preventing voltage droop before it occurs rather than reacting after the droop has happened.
Solution Approach 2:
The system uses a feedback mechanism where the detection circuit continuously monitors output voltage and feeds this information to the control circuit. The control circuit adjusts the current sources based on the detected voltage level, creating a closed-loop system that maintains voltage stability by responding to real-time conditions.
2Speed
If multiple current sources are used to quickly ramp up current, then response speed is improved, but device complexity increases
Solution Approach 1:
The current compensation is divided into multiple discrete current sources rather than using a single large current source. Each current source can be independently controlled and activated, allowing for gradual or rapid current ramping depending on the situation. This segmentation enables faster response while keeping each individual current source manageable in size.
Solution Approach 2:
The control circuit dynamically activates or deactivates current sources based on real-time voltage detection. The system transitions from a static voltage regulator to a dynamic system that can rapidly adjust current output by enabling/disabling specific current sources, achieving fast response without requiring all current sources to be permanently active.
3Volume of moving object
If on-die capacitors are reduced in size, then system size and cost are reduced, but voltage stabilization capability deteriorates
Solution Approach 1:
The system uses the voltage regulator's own current sources to stabilize voltage rather than relying on external capacitors. The detection and control circuits monitor and adjust the current output directly, making the system self-regulating without requiring large external energy storage components.
Solution Approach 2:
The system changes the operating parameters of the current sources dynamically to maintain voltage stability. By adjusting the current magnitude and timing based on detected voltage conditions, the system compensates for smaller capacitor sizes through active parameter control rather than passive energy storage.
Data Source
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AI summary
In a particular implementation, an apparatus to stabilize a supply voltage includes a first current source, a second current source, and a control circuit. The first current source is responsive to a detection signal and has an output coupled to a voltage regulator circuit via an output node. The second current source is also coupled to the output node. The control circuit includes an input responsive to the detection signal and an output coupled to the second current source. The control circuit is configured to enable the second current source based on a delayed version of the detection signal.