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:
Jun. 05, 2012
Filed:
Jul. 06, 2010
Heng-yu Jian, San Diego, CA (US);
Zhiwei Xu, Los Angeles, CA (US);
Yi-cheng Wu, Los Angeles, CA (US);
Mau-chung Frank Chang, Los Angeles, CA (US);
Heng-Yu Jian, San Diego, CA (US);
Zhiwei Xu, Los Angeles, CA (US);
Yi-Cheng Wu, Los Angeles, CA (US);
Mau-Chung Frank Chang, Los Angeles, CA (US);
Microchip Technology Incorporated, Chandler, AZ (US);
Abstract
A phase lock loop includes a quantization circuit that generators an out of phase noise cancellation signal from an error in a delta-sigma modulator and applies the noise cancellation signal to the charge pump. The quantization circuit includes a digital-to-analog differentiator. The digital-to-analog differentiator may be, for example, a single-bit first-order digital-to-analog differentiator, a single-bit second-order digital-to-analog differentiator, or a full M-bit binary-weighted digital to analog differentiator.