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:
Sep. 23, 2003
Filed:
Jun. 21, 2002
Sheng-Yeh Lai, Tai-Chung, TW;
Hung-Chih Liu, Hsinchu, TW;
Silicon Integrated System Corp., Taiwan, CN;
Abstract
A current output circuit for use in a digital-to-analog converter is disclosed. The current output circuit includes a current source for providing a driving current, and a first output circuit coupled with the current source. The first output circuit includes a first metal-oxide semiconductor (MOS) transistor device having a source electrode thereof connected to the current source in series, a first voltage amplifier coupled between the source electrode and a gate electrode of the first MOS transistor device for keeping a voltage of the source electrode substantially constant, and a first controlled switch coupled between an operational voltage and the gate electrode of the first MOS transistor device for being switched ON or OFF in response to a first digital control signal, and allowing the driving current to be outputted from a drain electrode of the MOS transistor device when the first controlled switch is switched ON.