Capless Voltage Regulator Compensation for Overshoot-Free Load Steps
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Solution Overview
Problem
Capless voltage regulators (CVRs) face challenges in responding quickly and accurately to sudden load fluctuations, leading to voltage overshoot or undershoot, which can increase response time and stability issues, especially as the reference voltage range becomes tighter.
Innovation Solution
A quasi-adaptive controller dynamically adjusts the slew rate of the pass device's gate voltage to match the output slew rate, preventing overshoot and undershoot by varying charging and discharging currents based on load current, ensuring stability and fast response across all load ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a capless voltage regulator uses fixed charging/discharging currents, then the circuit is simple, but voltage overshoot and undershoot occur during load transitions
Solution Approach 1:
The patent implements dynamic current sources that adjust charging and discharging currents based on real-time voltage conditions. The controller monitors the voltage across the capacitor and dynamically modifies the current magnitude to prevent overshoot and undershoot, transforming fixed current sources into adaptive ones that respond to load transitions.
Solution Approach 2:
The patent employs a feedback mechanism where the controller continuously monitors the capacitor voltage and adjusts the charging/discharging currents accordingly. This closed-loop control ensures that the current magnitude is optimized for each phase of the voltage transition, preventing both overshoot and undershoot while maintaining voltage stability.
2Measurement precision
If the reference voltage range is tightened to improve precision, then voltage regulation accuracy improves, but response time increases and stability deteriorates
Solution Approach 1:
The patent uses dynamic current adjustment to maintain fast response times even with tight voltage ranges. By increasing charging current when voltage is below the lower reference and using controlled discharging current when above the upper reference, the system achieves both precision and speed in voltage regulation.
Solution Approach 2:
The patent changes the current parameters dynamically based on the voltage state. When the capacitor voltage is below the lower reference voltage, a higher charging current is applied for faster response. When above the upper reference, a controlled discharging current is used. This parameter adaptation allows tight voltage ranges to be maintained without sacrificing response time.
3Stability of the object's composition
If larger capacitors are used to reduce voltage fluctuations, then voltage stability improves, but the area occupied increases
Solution Approach 1:
The patent replaces the mechanical approach of using larger physical capacitors with an electronic control system that dynamically adjusts charging and discharging currents. This substitution allows voltage stability to be achieved through intelligent current management rather than increased capacitance, thereby reducing substrate area consumption.
Solution Approach 2:
The patent changes the operational parameters of the voltage regulator by implementing adaptive current control. Instead of relying on large capacitor values for stability, the system achieves voltage fluctuation reduction through dynamic current adjustment, allowing the use of smaller capacitors and reducing overall circuit area.
Data Source
AI summary
An integrated circuit (IC) is disclosed that includes a load circuit, and a voltage regulator circuit configured to provide a load voltage and a load current to the load circuit. The voltage regulator circuit can regulate the load voltage based on the load current.