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. 31, 2019
Filed:
Jan. 03, 2018
Applicant:
Analog Devices, Inc., Norwood, MA (US);
Inventors:
Daniel F. Kelly, Andover, MA (US);
Franklin M. Murden, Roan Mountain, TN (US);
Daniel Rey-Losada, San Diego, CA (US);
Assignee:
ANALOG DEVICES, INC., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/45 (2006.01); H03F 1/22 (2006.01); H03F 3/68 (2006.01); H03G 3/00 (2006.01);
U.S. Cl.
CPC ...
H03F 3/45264 (2013.01); H03F 1/223 (2013.01); H03F 3/4565 (2013.01); H03F 3/45183 (2013.01); H03F 3/45188 (2013.01); H03F 3/45659 (2013.01); H03F 3/68 (2013.01); H03G 3/004 (2013.01); H03F 2203/45008 (2013.01); H03F 2203/45418 (2013.01); H03F 2203/45424 (2013.01); H03F 2203/45474 (2013.01);
Abstract
A common mode feedback (CMFB) loop for a differential amplifier sense an output common mode of a differential circuit and provides feedback to the gates of tail current transistors. Many CMFB loops cannot easily adjust the output common mode voltage and the output common mode may vary over process, voltage, and temperature. An improved CMFB circuit adds a control circuit to control backgates of tail current transistor device(s) of the differential circuit such that the output common mode voltage can be made adjustable.