Adaptive LDO Feedback Circuit for IR-Drop Voltage Stability
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Solution Overview
Problem
Conventional low-dropout voltage regulators struggle to maintain stable output voltage across varying load conditions due to IR-drop caused by internal resistance in power distribution networks, leading to potential circuit malfunctions.
Innovation Solution
A voltage generating device comprising a low-dropout voltage regulator with a feedback circuit and a control signal generator. The control signal generator compares a sensing voltage on the power distribution network with multiple threshold voltages to adjust the voltage dividing ratio of the feedback circuit, dynamically adjusting the output voltage in response to load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional low-dropout voltage regulator is used, then the output voltage can be provided to the power distribution network, but the output voltage becomes unstable under different load conditions due to IR-drop
Solution Approach 1:
The feedback circuit uses switchable resistor configurations that dynamically change the voltage dividing ratio based on load conditions. Multiple resistors can be connected in series or parallel through control switches, allowing the feedback circuit to adapt its division ratio dynamically rather than being fixed, thus maintaining stable output voltage across varying loads.
Solution Approach 2:
The invention changes the electrical parameters of the feedback circuit by switching between different resistor configurations. This alters the voltage dividing ratio parameter to compensate for IR-drop variations under different load conditions, enabling the system to maintain reliable output voltage stability.
2Adaptability or versatility
If the feedback circuit uses a fixed voltage dividing ratio, then the circuit structure is simple, but the output voltage cannot adapt to different load conditions
Solution Approach 1:
The feedback circuit is segmented into multiple resistor components that can be independently switched. Instead of using a single fixed resistor configuration, the circuit divides the voltage division function into segments that can be reconfigured based on load conditions, achieving adaptability without requiring a completely complex redesign.
Solution Approach 2:
The same feedback circuit structure serves multiple functions by switching between different resistor configurations. The feedback circuit can operate in multiple modes (different voltage dividing ratios) using the same physical components, making it universal for handling various load conditions without requiring separate circuits for each scenario.
Data Source
AI summary
A voltage generating device includes a low-dropout voltage regulator and a control signal generator. The low-dropout voltage regulator provides an output voltage to a power distribution network. The low-dropout voltage regulator has a feedback circuit. The feedback circuit divides the output voltage to generate a feedback voltage according to a voltage dividing ratio, and the feedback circuit sets the voltage dividing ratio according to multiple control signals. The control signal generator is coupled to the feedback circuit and the power distribution network, and generates the control signals by comparing a sensing voltage at a reference terminal of the power distribution network with multiple threshold voltages.