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. 05, 2011
Filed:
Mar. 11, 2010
Xiaobao Wang, Cupertino, CA (US);
Chiakang Sung, Milpitas, CA (US);
Bonnie I. Wang, Cupertino, CA (US);
Khai Nguyen, San Jose, CA (US);
John Henry Bui, Sunnyvale, CA (US);
Xiaobao Wang, Cupertino, CA (US);
Chiakang Sung, Milpitas, CA (US);
Bonnie I. Wang, Cupertino, CA (US);
Khai Nguyen, San Jose, CA (US);
John Henry Bui, Sunnyvale, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
A circuit includes first transistors and a comparator. The comparator compares a reference signal and a signal that is based on conductive states of the first transistors. A control circuit generates first control signals based on an output signal of the comparator. The conductive states of the first transistors are determined based on the first control signals. An arithmetic circuit performs an arithmetic function based on the first control signals and second control signals to generate calibration signals. Second transistors provide a termination impedance at an external terminal of the circuit that is based on the calibration signals.