Digital LDO Compensation Circuit for Convergence Stability
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Solution Overview
Problem
Digital low-dropout linear regulators face challenges with low convergence stability, which limits their application in portable systems and communication electronics.
Innovation Solution
A digital regulator system comprising a digital regulator circuit and a compensation circuit that adjusts output current and voltage to improve convergence stability, using comparators and current units to generate feedback voltage based on reference voltages and current adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If digital low-dropout linear regulator is used, then conversion efficiency and size are improved, but convergence stability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the output voltage is fed back through a compensation circuit to adjust the output current. The compensation circuit receives the output voltage and generates a compensation signal that is fed back to the control unit, creating a closed-loop system that continuously adjusts the output to maintain stability while preserving the high conversion efficiency of digital LDO architecture.
Solution Approach 2:
The patent introduces a compensation circuit as an intermediary element between the digital regulator circuit and the output load. This compensation circuit processes the output voltage and generates adjustment signals that mediate the control between the digital regulator and the output, thereby improving convergence stability without compromising the inherent efficiency advantages of digital LDO.
2Volume of moving object
If digital low-dropout linear regulator is used, then size is reduced, but convergence stability deteriorates
Solution Approach 1:
The feedback mechanism in the patent uses compact circuit elements to create a closed-loop control system. The compensation circuit and associated components are designed with minimal footprint, providing stability enhancement without significantly increasing the overall device size, thus maintaining the space advantages of digital LDO while improving convergence stability.
Solution Approach 2:
The patent adjusts electrical parameters within the compensation circuit, such as impedance values and gain characteristics, to optimize convergence stability. By carefully selecting and tuning these parameters, the system achieves improved stability performance without requiring proportional increases in component size or device footprint.
3Measurement precision
If output current is adjusted by unit current steps, then precision is improved, but response speed deteriorates
Solution Approach 1:
The patent employs periodic switching action in the compensation circuit to achieve smooth current adjustment. Rather than making single large-step adjustments, the system uses periodic small-step adjustments that accumulate to achieve the desired current change, thereby maintaining precision while improving the effective response speed through continuous incremental modification.
Solution Approach 2:
The patent implements dynamic adjustment mechanisms where the compensation circuit adapts its adjustment step size and frequency based on the system's current state. When rapid changes are needed, the system can take larger steps; when precision is critical, it transitions to smaller incremental steps. This dynamic behavior allows the system to optimize between response speed and precision depending on operating conditions.
Data Source
AI summary
A digital regulator system is provided. The digital regulator system includes a digital regulator circuit and a compensation circuit. The digital regulator circuit outputs an output current and an output voltage. The digital regulator circuit adjust the output current by decreasing or increasing a unit current according to at least a reference voltage and a feedback voltage. The compensation circuit receives the output voltage as well as decreases or increases a unit voltage of the output voltage to generate and output the feedback voltage according to the variation of the output current.