Voltage regulation device with dual-loop design

A voltage regulation device, comprising:

• a first low-dropout (LDO) regulator, configured to receive an input voltage of the voltage regulation device and accordingly generate and stabilize an output voltage of the voltage regulation device, comprising:
• a first differential amplifier, configured to generate a first driving voltage based on a difference between the output voltage and a reference voltage;
• and
• a first pass transistor, coupled to the first differential amplifier, driven by the first driving voltage to regulate the output voltage;
• a second LDO regulator, coupled in parallel with the first LDO regulator, configured to provide supplementary regulation to further stabilize the output voltage, comprising:
• a second differential amplifier, configured to generate a second driving voltage based on the difference between the output voltage and the reference voltage;
• and
• a second pass transistor, coupled to the second differential amplifier, driven by the second driving voltage to regulate the output voltage;
• and
• a signal coupling circuit, coupled between the first LDO regulator and the second LDO regulator, configured to apply a voltage provided by second LDO regulator to the first LDO regulator, thereby modulating an operation of the first LDO regulator, comprising:
• a current mirror circuit, coupled to the input voltage and an output terminal of the second differential amplifier, configured to generate an output current according to an input current that is generated based on the second driving voltage provided by the second differential amplifier;
• and;
• a coupling capacitor, coupled between an output terminal of the current mirror circuit and an output terminal of the first differential amplifier, configured to facilitate coupling of voltage fluctuation that is induced by the output current of the current mirror circuit to the output terminal of the first differential amplifier.