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:
Apr. 10, 2018
Filed:
Feb. 02, 2017
International Business Machines Corporation, Armonk, NY (US);
Timothy O. Dickson, Danbury, CT (US);
Mounir Meghelli, Tarrytown, NY (US);
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
A timing error detection circuit for calibrating a serial transmitter is disclosed. The circuit includes a data source configured to provide data for serial transmission and a clock source configured to produce N versions of a sampling clock that are at N different phases of the sampling clock. The detection circuit has a first sampler configured to sample the data source by using a first phase of the sampling clock to generate a first sampled signal and a second sampler configured to sample the data source by using a second phase of the sampling clock to generate a second sampled signal. The detection circuit also includes a first comparator configured to compare the first and second sampled signals to generate a difference signal and a first low-pass filter configured to filter the difference signal to generate an average difference voltage. A second comparator in the detection circuit is configured to compare the average difference voltage with a reference voltage.