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. 22, 2014
Filed:
Nov. 03, 2011
Applicants:
Sangeeta Raman, San Jose, CA (US);
Tim Tri Hoang, San Jose, CA (US);
Inventors:
Sangeeta Raman, San Jose, CA (US);
Tim Tri Hoang, San Jose, CA (US);
Assignee:
Altera Corporation, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 5/159 (2006.01); H03H 7/30 (2006.01); H03H 7/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
Devices and methods for serial loopback testing in an integrated circuit (IC) are provided. To implement loopback testing, an equalizer stage of a receiver of the IC is powered down. In addition, the common-mode voltage of the equalizer stage is reduced and/or a bulk node of the equalizer stage is connected to ground. Doing so may reduce the impact of capacitive coupling from the input pins of buffer, thereby improving the quality of the loopback output signal.