Voltage regulator and method for compensating the effects of an output impedance

US10503188B2 · kind B2 · utility

Assignee

• Dialog Semiconductor (UK) Limited · GB

Inventors

• Carlos Ramos · Munich, DE
• Frank Kronmueller · Neudenau, DE
• Ambreesh Bhattad · Swindon, GB

Key dates

• Filing date: Dec 18, 2018
• Grant date: Dec 10, 2019
• Expiry date: Dec 18, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F1/565
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A voltage regulator is presented. The output node of the voltage regulator is coupled to an output capacitor via a conductive path that exhibits a parasitic inductance. The voltage regulator has an output amplification stage for deriving the output current at the output node from the input voltage at the input node in dependence of a drive voltage at an intermediate node of the voltage regulator. The voltage regulator has an intermediate amplification stage for providing the drive voltage at the intermediate node based on a differential output voltage. A differential amplification stage determines the differential output voltage in dependence of the output voltage and in dependence of a reference voltage. The voltage regulator has a sensing unit to provide a load indication which is indicative of the output current and a variable impedance coupled to the intermediate node, where the variable impedance is dependent on the load indication.