Calibration of a dual-path pulse width modulation system

US10263584B1 · kind B1 · utility

Assignee

• CIRRUS LOGIC, INC. · US

Inventors

• Tejasvi Das · Austin, US
• Alan Mark Morton · Fullerton, US
• Xin Zhao · Austin, US
• Lei Zhu · Beijing, CN
• Xiaofan Fei · Austin, US
• Johann G. Gaboriau · Austin, US
• John L. Melanson · Austin, US
• Amar Vellanki · Cedar Park, US

Key dates

• Filing date: Sep 17, 2018
• Grant date: Apr 16, 2019
• Expiry date: Sep 17, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04R2499/11
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A system may include a digital pulse width modulator subsystem, a first path coupled to an output of the digital pulse width modulator subsystem, a second path coupled to the output of the digital pulse width modulator subsystem and configured to drive a closed-loop analog pulse width modulator, a controller to select between the first path and the second path for processing a signal based on one or more characteristics of the signal, wherein a first gain of the first path and a second gain of the second path are approximately equal at the time of switching selection between the first path and the second path or vice versa, in order to minimize artifacts due to the switching.