The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2022
Filed:
Aug. 24, 2020
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Angus Black, Edinburgh, GB;
Hemant Shukla, Edinburgh, GB;
Cirrus Logic, Inc., Austin, TX (US);
Abstract
This application describes an amplifier circuit () with a forward signal path with a class-D output stage () for generating a driving signal (Sout) based on a digital input signal (Sin). The amplifier has a first feedback path for providing a first digital feedback signal (Sfb) based on the driving signal and a second feedback path for providing a second digital feedback signal (Sfb) from a digital part of the forward signal path. The digital input signal (Sin) is combined with a selected feedback signal (Sfbs). The amplifier circuit is selectively operable in a first mode, in which the first feedback signal is used as the selected feedback signal, and in a second mode, in which the second feedback signal is used as the selected feedback signal. A calibration module () is operable to calibrate the first feedback path to reduce any DC offset when the amplifier circuit is operating in the second mode.