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:
Dec. 17, 2019
Filed:
Sep. 26, 2018
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Tao Mai, Santa Clara, CA (US);
Simone Gambini, San Francisco, CA (US);
Assignee:
Apple Inc., Cupertino, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/06 (2006.01); H03M 3/00 (2006.01);
U.S. Cl.
CPC ...
H03M 3/436 (2013.01); H03M 3/368 (2013.01); H03M 3/422 (2013.01); H03M 3/462 (2013.01);
Abstract
An Nth-order loop filter includes N integrators (where N is an integer value). The loop filter includes an initialization path coupled between an input to the loop filter and an input of at least one of the integrators. A control circuit is coupled to the Nth order filter. During a reset phase, the control circuit causes an initialization voltage to be sampled into a capacitance of the initialization path. During an initialization phase immediately following the reset phase, the control circuit causes the initialization voltage to be conveyed to the input(s) of the at least one integrator.