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. 21, 2014
Filed:
Mar. 31, 2009
Kameran Azadet, Morganville, NJ (US);
Samer Hijazi, Bethlehem, PA (US);
Joseph H. Othmer, Ocean, NJ (US);
Kameran Azadet, Morganville, NJ (US);
Samer Hijazi, Bethlehem, PA (US);
Joseph H. Othmer, Ocean, NJ (US);
Agere Systems LLC, Allentown, PA (US);
Abstract
Methods and apparatus are provided for direct synthesis of RF signals using a delta-sigma modulator. An RF signal is synthesized from an input signal by quantizing the input signal using a quantizer, such as a one bit quantizer; determining a quantization error associated with the quantizer; generating an error prediction value using an error predictive filter, wherein the error predictive filter comprises one or more filter zeroes on a unit circle for one or more desired frequencies of f, f, . . . fand one or more filter poles having a magnitude inside the unit circle and a frequency substantially equal to the one or more desired frequencies of f, f, . . . f; and subtracting the error prediction value from the input signal. The filter poles have a magnitude that reduces a boost provided out-of-band.