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:
Apr. 28, 1998
Filed:
Apr. 07, 1997
Rong-Tyan Wu, Hsinchu, TW;
Holtek Microelectronics, Inc., Hsinchu, TW;
Abstract
This present invention relates to a level-shift type digital to analog converter including a selection circuit, a multiple voltage level generation circuit, a stabilization circuit and a level-shift type buffer stage circuit. The multiple voltage level generation circuit is composed by a divided-step voltage output circuit and a level voltage output circuit, for generating a plurality of voltage levels to directly output to a level-shift type buffer stage circuit or alternatively, to be processed through voltage selection in order to respectively output the divided-step voltage output values and the level voltage output values to a level-shift type buffer stage circuit. A stabilization circuit generates a reference voltage or a reference current insensitive to the power supply voltage V.sub.DD for other elements of the converter. Finally, the level-shift type buffer stage circuit synthesizes the received divided-step voltage and the level voltage, amplifies them with appropriate times and finally converts them to analog output signals.