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. 06, 1987
Filed:
Nov. 08, 1985
Applicant:
Inventor:
John M Wincn, Cupertino, CA (US);
Assignee:
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
3403 / ;
Abstract
A digital-to-analog converter for converting a digital signal having a plurality of binary bits into an analog output signal includes an R-2R ladder network forming a plurality of switching cells corresponding in number to the number of the binary bits. Each switching cell is formed of first, second and third pairs of CMOS transistors defining cross resistances of the ladder network and of a fourth pair of CMOS transistors defining a series resistance of ladder network. A pair of differential circuits drives each switching cell to control switching symmetry and conversion speed.