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:
Jul. 21, 2020
Filed:
Jul. 26, 2019
Powerchip Semiconductor Manufacturing Corporation, Hsinchu, TW;
Tomofumi Kitani, Tokyo, JP;
Powerchip Semiconductor Manufacturing Corporation, Hsinchu, TW;
Abstract
An offset voltage Vis compensated in a digital to analog (DA) convertor using a switched-capacitor circuit, including an input circuit, a first differential amplifier, and an offset cancel circuit comprising a second differential amplifier, in a sampling period, when the second feedback circuit is short, an output voltage of the first differential amplifier is input to a first end of a first capacitor, the offset cancel circuit feeds back a reference voltage to an inverting input terminal of the second differential amplifier and a second end of the first capacitor from an output of the second differential amplifier, in a holding period, when the second feedback circuit is not short, the offset cancel circuit inputs a differential voltage between the reference voltage and the output voltage of the first differential amplifier into an inverting input terminal of the first differential amplifier via a second capacitor.