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:
Jul. 26, 2011
Filed:
Oct. 15, 2009
Ian Galton, Del Mar, CA (US);
Ashok Swaminathan, San Diego, CA (US);
Ian Galton, Del Mar, CA (US);
Ashok Swaminathan, San Diego, CA (US);
The Regents of the University of California, Oakland, CA (US);
Abstract
A successive requantizer, which serves as a replacement for a ΔΣ modulator in a fractional-N PLL or a DAC, and avoids spurious tone problems, thereby circumventing the tradeoffs that result from reliance on the common approach of making highly linear analog circuitry to avoid spurious tones. A successive requantizer fractional-N PLL of the invention has the potential to reduce power consumption and the cost of commercial communication devices. The successive requantizer performs digital quantization one bit at a time in such a way that the quantization noise can he engineered to have desirable properties such as non-linearity robustness. The successive requantizer is applicable to most high-performance digital communication systems, such as cellular telephone handsets and wireless local and metropolitan area network transceivers.