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:
Mar. 03, 1987
Filed:
Mar. 07, 1984
Applicant:
Inventor:
Kazuo Ryu, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
3403 / ; 3403 / ;
Abstract
In order to reduce the numbers of resistors and associated switches required in a successive approximation type a-d converter, a resistor-ladder of the d-a converter utilizes a first group of resistors (resistance R) and a second group of resistors each having a resistance equal to R/2.sup.L wherein L is the number of lower bits of the digital output. The second group of resistors enables the generation of variable comparison reference signals in response to the output of a successive approximation register.