Regulator circuit

By dynamically adjusting the dynamic zero-point frequency in the LDO regulator circuit, the system instability caused by load current changes is solved, and the stable operation of the regulator circuit under different load conditions and the power supply voltage suppression effect are achieved.

CN117970989BActive Publication Date: 2026-06-30SG MICRO CORP
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SG MICRO CORP
Filing Date
2023-11-14
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

When the load current changes, the load impedance of the existing LDO regulator circuit becomes unstable due to the different closed-loop system. The fixed zero-point compensation method cannot meet the stability requirements under all load conditions, and the existing dynamic zero-point compensation method results in a large circuit area.

Method used

By using a load current sampling unit, a mirror unit, and a dynamic zero-point generation unit, the capacitance value and frequency of the dynamic zero-point are dynamically adjusted to enable the frequency of the dynamic zero-point to follow the frequency change of the secondary pole, thereby performing dynamic frequency compensation and ensuring that the negative feedback system operates stably under different load conditions.

Benefits of technology

Stable operation of the voltage regulator circuit under different load conditions was achieved, the circuit area was reduced, and the power supply voltage rejection ratio and response speed were improved.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117970989B_ABST
    Figure CN117970989B_ABST
Patent Text Reader

Abstract

Embodiments of this disclosure provide a voltage regulator circuit, including an output module and a zero-point compensation module. The output module is configured to determine a first frequency of a secondary pole at the first current based on a first current flowing through a load element, wherein the first frequency of the secondary pole is positively correlated with the first current. The zero-point compensation module is configured to adjust the capacitance value of a dynamic zero point based on the first current, and determine a second frequency of the dynamic zero point based on the capacitance value of the dynamic zero point, wherein the second frequency of the dynamic zero point is the same as the first frequency of the secondary pole. The capacitance value of the dynamic zero point is negatively correlated with the first current, and the second frequency is positively correlated with the first current. The second frequency compensates for the first frequency, enabling the second frequency of the dynamic zero point to follow the first frequency of the secondary pole. The dynamic zero point tracks the frequency change of the secondary pole, achieving dynamic frequency compensation for the secondary pole, ensuring stable operation of the negative feedback system regardless of the voltage regulator circuit's state.
Need to check novelty before this filing date? Find Prior Art