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. 30, 1993
Filed:
Nov. 07, 1991
Applicant:
Inventors:
Henry Samueli, Northridge, CA (US);
Ralph H Brackert, Torrance, CA (US);
Assignee:
PairGain Technologies, Inc., Cerritos, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341144 ; 341147 ;
Abstract
A digital-to-analog converter (DAC) is disclosed which uses an oversampled modulation technique followed by an analog lowpass filter to generate an output waveform with four precisely controlled amplitude levels for 2B1Q data transmission applications. The DAC accepts a 2-bit input word at the baud rate and generates one of four possible analog output amplitudes having relative ratios of +3, +1, -1, and -3.