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:
Dec. 07, 2021
Filed:
Dec. 25, 2020
Smarter Microelectronics (Guang Zhou) Co., Ltd., Guangzhou, CN;
Jiangtao Yi, Guangzhou, CN;
Xin Zhang, Guangzhou, CN;
Qiang Su, Guangzhou, CN;
Chifeng Liu, Guangzhou, CN;
SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou, CN;
Abstract
A digital-to-analog conversion circuit includes an operational amplification module having an operational amplifier connected to an output transistor to form a negative feedback circuit to obtain equal voltages at positive and negative ends. A negative end current flowing into the negative end is proportional to a positive end current flowing into the positive end. An input end of a conversion module is connected in parallel with a first resistor of the operational amplification module to obtain the same voltage as the first resistor, and an analog current proportional to the negative end current and positive end current. An output end of the conversion module is connected with the source of the output transistor and configured to receive the analog current and to make the analog current flow to an output resistor via the drain of the output transistor, to obtain an output current proportional to the positive end current.