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:
Mar. 13, 2018
Filed:
Apr. 17, 2017
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Lei Zhu, Austin, TX (US);
Xin Zhao, Austin, TX (US);
Tejasvi Das, Austin, TX (US);
Alan Mark Morton, Austin, TX (US);
Xiaofan Fei, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A method for offset calibration may include decoupling a modulator input of a first path from a first stage output, coupling a second path output to the modulator input, applying a common-mode voltage to a second path input, receiving a calibration signal from the modulator output generated in response to the common-mode voltage, and modifying one or more parameters of the modulator to compensate for an offset between the first path and the second path indicated by the calibration signal. A method for gain calibration may include decoupling a modulator input from a first stage output, decoupling a second path from the first stage output, applying a first test signal to the modulator input, applying a second test signal to a second path input, wherein the second test signal is of opposite phase as the first test signal, coupling a second path output to an amplifier input via a calibration feedback network, receiving a calibration signal from the first stage output generated in response to the first test signal and the second test signal, and modifying one or more parameters of the second path to compensate for a difference in respective gains of the modulator and the second path indicated by the calibration signal.