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:
Nov. 25, 2008
Filed:
Jun. 14, 2007
Dongwon Seo, San Diego, CA (US);
BO Sun, Carlsbad, CA (US);
Gurkanwal S. Sahota, San Diego, CA (US);
Manu Mishra, San Diego, CA (US);
Dongwon Seo, San Diego, CA (US);
Bo Sun, Carlsbad, CA (US);
Gurkanwal S. Sahota, San Diego, CA (US);
Manu Mishra, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A digital-to-analog converter, RF transmit channel and method, for converting a digital signal of N bits having a set M of most significant bits and a set L of least significant bits to an analog signal, are disclosed. The digital signal defines a set of coded values which are converted to analog values and modulated on to a RF signal. The digital-to-analog converter includes a plurality of switches and an output stage, for providing at least a first differential output signal and a second differential output signal. The output stage modifies currents received from the plurality of switches, such that the value of the average output current of the first and second differential outputs signals is steered to a relatively low current value at the mid-point of the coded values.