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:
Dec. 01, 2015
Filed:
Jul. 26, 2013
Applicant:
Altera Corporation, San Jose, CA (US);
Inventors:
Tim Tri Hoang, San Jose, CA (US);
Rabindranath Balasubramanian, Dublin, CA (US);
Assignee:
Altera Corporation, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/26 (2006.01); H03F 3/193 (2006.01); H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
H03F 1/26 (2013.01); H03F 3/193 (2013.01); H03F 3/45179 (2013.01); H03F 3/45475 (2013.01);
Abstract
A circuit includes a first amplifier circuit and a second amplifier circuit. The second amplifier circuit includes an input coupled to an output of the first amplifier circuit. A pass gate circuit is coupled between first and second inputs of the first amplifier circuit. The pass gate circuit is on during calibration of the second amplifier circuit to short together signals at the first and the second inputs of the first amplifier circuit. The pass gate circuit is off during a normal mode of the first and the second amplifier circuits.