Charge injection for ultra-fast voltage control in voltage regulators

US10152071B2 · kind B2 · utility

Assignee

• Dialog Semiconductor (UK) Limited · GB

Inventors

• Dan Ciomaga · Ingolstadt, DE
• Mihail Jefremow · Augsburg, DE
• Stephan Drebinger · Munich, DE
• Fabio Rigoni · Karlsfeld, DE

Key dates

• Filing date: Nov 21, 2016
• Grant date: Dec 11, 2018
• Expiry date: Nov 21, 2036

Classification

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

Abstract

This application relates to a circuit for generating an output voltage and regulating the output voltage to a target voltage. The circuit includes a switchable voltage divider circuit configured to generate a feedback voltage that is a variable fraction of the output voltage, an error amplifier stage configured to generate a control voltage on the basis of a reference voltage and the variable fraction of the output voltage, a buffer stage configured to generate the output voltage on the basis of the control voltage, and a charge injection circuit configured to inject charge at an intermediate node between the error amplifier stage and the buffer stage to thereby modify the control voltage generated by the error amplifier stage. The application further relates to a method of operating such circuit.