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.

Date of Patent:
Nov. 29, 2016

Filed:

Jan. 10, 2016
Applicant:

Freescale Semiconductor, Inc., Austin, TX (US);

Inventors:

Meng Liu, Tianjin, CN;

Bin Feng, Tianjin, CN;

Liang Qiu, Tianjin, CN;

Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 5/135 (2006.01); H03K 3/84 (2006.01);
U.S. Cl.
CPC ...
H03K 5/135 (2013.01); H03K 3/84 (2013.01);
Abstract

A spread-spectrum clock (SSC) generator for generating an SSC signal. The SSC generator has a first up/down counter that operates for a fixed, first duration (t1), a first PRBS generator that operate for a variable, second duration (t2), a second up/down counter that operates for a fixed, third duration (t3), and a second PRBS generator that operates for a variable, fourth duration (t4). A state machine sequentially triggers the first counter and the first PRBS generator to generate a positive portion of a cycle of the SSC signal and then sequentially triggers the second counter and the second PRBS generator to generate a negative portion of the cycle of the SSC signal. For a set of parameters stored in configurable registers, the first and third durations are fixed from cycle to cycle, while the second and fourth durations vary from cycle to cycle.


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