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. 26, 2021
Filed:
Dec. 17, 2019
Renesas Electronics Corporation, Tokyo, JP;
RENESAS ELECTRONICS CORPORATION, Tokyo, JP;
Abstract
A conventional analog-to-digital conversion circuit has a problem that conversion errors cannot be suppressed. According to one embodiment, the analog-to-digital conversion circuit includes a first digital-to-analog conversion circuitof a capacitance distribution type, a second digital-to-analog conversion circuitof a capacitance distribution type, and a comparison circuitfor comparing output voltages of the two digital-to-analog conversion circuits, and before performing a successive comparison operation for successively changing a reference voltage applied to the first digital-to-analog conversion circuit, generates an intermediate digital value having a digital value corresponding to a voltage value of an analog input signal, determines a reference voltage to be applied to the second digital-to-analog conversion circuitin accordance with the intermediate digital value, and thereafter performs a successive comparison operation using the first digital-to-analog conversion circuitin a state in which the state of the second digital-to-analog conversion circuitis held.