Current-Controlled Voltage Regulation for IC Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Voltage regulators in electronic devices face challenges in maintaining a stable output voltage due to repetitive changes in load current, leading to significant voltage dips that can impact the performance of integrated circuits, particularly when cores are powered down to conserve energy.
Innovation Solution
An integrated circuit with a current-controlled voltage regulation system that includes a voltage regulator, error amplifier, and a current-controlled clamp, which estimates the regulator current and adjusts the error amplifier output voltage to mitigate voltage dips by clamping it based on the estimated current, thereby maintaining a stable voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the core is powered down to reduce power consumption, then energy consumption is reduced, but the voltage regulator experiences repetitive load current changes causing output voltage dips
Solution Approach 1:
The clamp circuit proactively detects when the load current drops below a threshold and preemptively adjusts the error amplifier output voltage to prevent voltage dips before they occur, rather than reacting after the dip has already happened
Solution Approach 2:
The clamp circuit acts as an intermediary between the error amplifier and the output, selectively clamping the error amplifier output voltage based on load current conditions to protect the output voltage from dips caused by repetitive load changes
2Adaptability or versatility
If the load current fluctuates repetitively between low and high levels, then power management flexibility is improved, but the voltage regulator output voltage exhibits pronounced dips affecting load performance
Solution Approach 1:
The clamp circuit dynamically adjusts its operation based on real-time load current conditions, transitioning between active clamping and inactive states to match the dynamic nature of the load current fluctuations while maintaining voltage stability
Solution Approach 2:
The circuit uses feedback from the load current sensing to control the clamp circuit operation, creating a closed-loop system that automatically responds to load current changes and maintains stable output voltage through continuous monitoring and adjustment
Data Source
AI summary
An integrated circuit is disclosed for current-controlled voltage regulation. In an example aspect, the integrated circuit includes a voltage regulator and a current-controlled clamp. The voltage regulator has a regulator output node and produces a regulator current. The voltage regulator includes an error amplifier and an output transistor. The error amplifier has first and second input nodes and an error amplifier output node, with the first input node coupled to a reference voltage. The error amplifier generates an error amplifier output voltage at the output node. The output transistor is coupled between the error amplifier output node and the regulator output node. The output transistor is coupled to the second input node via the regulator output node to establish a feedback path for the voltage regulator. The current-controlled clamp is coupled to the error amplifier output node and clamps the error amplifier output voltage based on the regulator current.