Adaptive LDO Voltage Regulator with Segmented Driving Stages
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Solution Overview
Problem
Conventional low drop-out (LDO) voltage regulators often require excessive driving capability due to process parameter drift, temperature changes, and power supply voltage shifts, leading to wasted circuit area and unnecessary power consumption.
Innovation Solution
A voltage regulator with a self-adjustable driving capability, comprising a main driving stage circuit, pre-driving circuits, auxiliary driving stage circuits, and a comparison and decoding circuit, which dynamically adjusts the number of activated auxiliary driving stage circuits based on the comparison between simulated and load currents, allowing for precise adjustment of driving capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving stage circuit is provided with excessive driving capability to compensate for process parameter drift and temperature changes, then the reliability of the voltage regulator is improved, but the circuit area and power consumption increase
Solution Approach 1:
The driving stage circuit is divided into a main driving stage circuit and multiple auxiliary driving stage circuits. The auxiliary circuits are selectively activated based on actual load requirements, allowing the system to have large total capability but only use what is needed, thus reducing the effective circuit area occupied and power consumption while maintaining reliability.
Solution Approach 2:
The voltage regulator employs dynamic adjustment of driving capability through the comparison and decoding circuit that selectively enables auxiliary driving stage circuits based on real-time comparison between simulated and load currents. This dynamic adaptation allows the system to maintain reliability under varying conditions without permanently allocating excessive circuit resources.
2Reliability
If the driving stage circuit is provided with excessive driving capability to ensure sufficient driving current under various conditions, then the reliability is improved, but the power consumption increases
Solution Approach 1:
The driving capability is segmented into a main driving stage circuit and multiple auxiliary driving stage circuits. Only the necessary portion is activated based on actual needs, reducing overall power consumption while ensuring sufficient driving current is available when required for reliability.
Solution Approach 2:
The system dynamically changes the operating parameters by selectively enabling or disabling auxiliary driving stage circuits based on the comparison between simulated and load currents. This parameter adjustment optimizes power consumption while maintaining the reliability needed for sufficient driving current under various operating conditions.
3Reliability
If the driving capability is increased to account for process parameter drift and power supply voltage shifts, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The driving stage circuit is segmented into a main driving stage circuit and multiple auxiliary driving stage circuits, each with defined functions. This segmentation manages complexity by organizing the increased driving capability into modular, manageable units that can be selectively activated based on reliability requirements.
Solution Approach 2:
The comparison and decoding circuit provides feedback control by comparing simulated driving current with load current and selectively enabling auxiliary driving stage circuits accordingly. This feedback mechanism automates the complexity management, allowing the system to adapt to process parameter drift and voltage shifts without requiring complex manual design adjustments.
Data Source
AI summary
A voltage regulator includes a main driving stage circuit, a first pre-driving circuit, a plurality of auxiliary driving stage circuits, a second pre-driving circuit, and a comparison and decoding circuit. The main driving stage circuit provides a main driving current of an output voltage according to a first control signal. Each of the auxiliary driving stage circuits determines whether to provide an auxiliary driving current of the output voltage according to a second control signal. The second pre-driving circuit generates the second control signal according to an enable signal. The comparison and decoding circuit generates a simulated driving current and generates a load current according to a reference current and a counting code, compares the simulated driving current with the load current to generate a comparison result, and generates the enable signal by decoding the comparison result. The counting code is generated according to the comparison result.