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:
Jul. 18, 2017
Filed:
Aug. 12, 2011
Bonnie I. Wang, San Jose, CA (US);
Chiakang Sung, San Jose, CA (US);
Xiaobao Wang, San Jose, CA (US);
Yan Chong, San Jose, CA (US);
Joseph Huang, San Jose, CA (US);
Khai Nguyen, San Jose, CA (US);
Pradeep Nagarajan, San Jose, CA (US);
Bonnie I. Wang, San Jose, CA (US);
Chiakang Sung, San Jose, CA (US);
Xiaobao Wang, San Jose, CA (US);
Yan Chong, San Jose, CA (US);
Joseph Huang, San Jose, CA (US);
Khai Nguyen, San Jose, CA (US);
Pradeep Nagarajan, San Jose, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
A buffer circuit with an adjustable reference voltage is presented. The buffer circuit with adjustable reference voltage has an input buffer circuit that is connected to a data input and a reference voltage. The output of the input buffer circuit is connected an eye monitor circuit that generates a transition signal based on a number of transitions of an output of the input buffer circuit. The output from the eye monitor circuit is that processed by a calibration control circuit that transmits a selection signal to a multiplexer. The multiplexer selects a level of the reference voltage based on the selection signal from the calibration control circuit.