Self-Stabilized LDO Regulator With Simplified Frequency Compensation
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Solution Overview
Problem
Conventional low-dropout voltage regulators require complex compensation circuits and large impedance values, leading to a need for a simpler circuit structure.
Innovation Solution
A low-dropout voltage regulator design incorporating a differential amplifier pair, self-stabilized secondary amplification circuit, output circuit, and frequency compensation circuit, eliminating the need for additional compensation circuits and featuring a small internal capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional low-dropout voltage regulators use traditional compensation circuits, then stability is ensured, but circuit complexity increases and large impedance values are required
Solution Approach 1:
The patent extracts the stability function from the traditional Miller compensation circuit and implements it through the intrinsic properties of the secondary amplification circuit. By removing the need for external compensation capacitors and complex impedance networks, the design achieves stability through the natural feedback mechanism of the amplification stages, thereby simplifying the circuit structure while maintaining reliability
Solution Approach 2:
The secondary amplification circuit is designed to be self-stabilized, meaning it automatically maintains stability through its own internal characteristics without requiring external compensation components. The circuit uses its own output to provide feedback that ensures stable operation, eliminating the need for additional compensation circuits and large impedance elements
2Reliability
If additional compensation circuits are added to ensure stability, then reliability improves, but device complexity increases
Solution Approach 1:
The patent merges the amplification function and the stability function into a single integrated secondary amplification circuit. Instead of having separate amplification stages and separate compensation circuits, the design combines these functions so that the amplification circuit inherently provides stability through its feedback mechanism, thereby reducing overall device complexity while maintaining reliability
Solution Approach 2:
The secondary amplification circuit is designed to perform multiple functions simultaneously: it provides voltage amplification while also ensuring circuit stability through its self-stabilized feedback mechanism. This multi-functionality eliminates the need for dedicated compensation circuits, reducing the number of components and simplifying the overall device structure
Data Source
AI summary
A low-dropout voltage regulator is provided. The low-dropout voltage regulator includes a differential amplifier pair, a secondary amplification circuit that is self-stabilized, an output circuit, and a frequency compensation circuit. The secondary amplification circuit includes a first amplification transistor and a second amplification transistor. The first amplification transistor includes a first terminal, a second terminal, and a third terminal. The second amplification transistor includes a first terminal, a second terminal, and a third terminal. The second terminal of the first amplification transistor is electrically connected to the second terminal of the second amplification transistor to form an input terminal of the secondary amplification circuit to be connected to an output terminal of the differential amplifier pair. The frequency compensation circuit is disposed between an output terminal of the secondary amplification circuit, a second terminal of an output transistor, and a third terminal of the output transistor.