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:
Oct. 30, 2001
Filed:
Oct. 23, 1998
Applicant:
Inventors:
Christopher John Reed, Potters Bar, GB;
Simon Gale, Bishop's Stortford, GB;
Assignee:
Nortel Networks Limited, St. Laurent, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 2/500 ;
U.S. Cl.
CPC ...
H04L 2/500 ;
Abstract
Current telecommunications device transmission stages require a significant number of analogue (DAC) components. The present invention provides a digital to analogue converter implementation for coupling to the digital signal processing (DSP) stage of the device and comprises a DAC and means to nullify the output of the DAC over part of the DSP data output period to produce a series of pulses corresponding to this data. The pulses are bandpass filtered to produce an analogue output signal at an intermediate frequency.