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:
Jun. 23, 2015
Filed:
Feb. 03, 2015
Fujitsu Semiconductor Limited, Yokohama-shi, Kanagawa, JP;
Tomoya Kakamu, Gifu, JP;
FUJITSU SEMICONDUCTOR LIMITED, Yokohama, JP;
Abstract
A digital-to-analog conversion circuit includes first current sources weighted depending on lower-order bits of digital input signals and supplied with a first bias voltage and second current sources weighted depending on higher-order bits of the digital input signals and supplied with a second bias voltage. A reference current source circuit generates the first and second bias voltages based on a first reference current. An output circuit combines currents from the first and second current sources in accordance with the digital input signals to generate an output current, the currents from the first and second current sources being set according to the first reference current. A correction circuit changes the first reference current into a second reference current smaller than the first reference current, and adjusts the first and second bias voltages based on currents from the first and second current sources changed according to the second reference current.