Dynamic Bias Generator for LDO Regulator Transient Stability
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Solution Overview
Problem
Low quiescent current voltage regulators, such as ultra-low dropout (LDO) regulators, face instability and degraded load transient performance during transients, making it challenging to maintain stability and performance across a wide load range.
Innovation Solution
A dynamic bias generator is introduced, comprising a slope generator and a peak detector that adjusts bias control voltages in response to changes in output current, allowing for improved stability and fast load transient response by modifying loop parameters and characteristics of the voltage regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low quiescent current is used in LDO regulators, then power consumption is reduced, but stability and load transient performance deteriorate
Solution Approach 1:
The patent implements dynamic biasing that adjusts the bias current based on load conditions. During transient states, the bias current is increased to maintain stability and fast response. During steady-state light load conditions, the bias current is reduced to minimize quiescent current consumption. This dynamic adjustment resolves the contradiction between low power consumption and stability during transients.
Solution Approach 2:
The patent changes the bias current parameter dynamically based on operating conditions. By detecting load transient conditions and adjusting the bias current accordingly, the system maintains optimal performance across different operating states, resolving the trade-off between low quiescent current and transient stability.
2Speed
If bias current is increased to improve transient response, then load transient performance improves, but quiescent current consumption increases
Solution Approach 1:
The system dynamically adjusts bias current based on detected transient conditions. During transients, bias current is increased to improve response speed. During steady-state operation, bias current is reduced to minimize power consumption, thus resolving the contradiction between speed and energy consumption.
Solution Approach 2:
The bias current is applied periodically or temporarily during detected transient events rather than continuously. This allows fast transient response when needed while minimizing quiescent current consumption during normal operation.
3Stability of the object's composition
If loop parameters are optimized for stability, then stability improves, but load transient performance degrades
Solution Approach 1:
The patent dynamically adjusts loop parameters including bias current based on operating conditions. During transients, loop parameters are modified to improve response speed. During steady-state, parameters are optimized for stability. This dynamic adaptation resolves the contradiction between stability and transient performance.
Solution Approach 2:
Loop parameters such as bias current are changed dynamically based on detected conditions. This allows the system to optimize for stability during normal operation and for transient response during load changes, resolving the trade-off between these two performance aspects.
Data Source
AI summary
Methods and apparatus for a dynamic bias generator are provided. In an example, a dynamic bias generator for a voltage regulator can include a slope generator and a peak detector coupled to the slope generator. In certain examples, the slope generator and the peak detector can receive a representation of output current of the voltage regulator and can adjust a bias control voltage at an output of the peak detector in response to a change in the output current of the voltage regulator.