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:
Feb. 14, 2006
Filed:
Feb. 13, 2004
Applicants:
Masahiro Kudo, Kawasaki, JP;
Kunihiko Gotoh, Kawasaki, JP;
Inventors:
Masahiro Kudo, Kawasaki, JP;
Kunihiko Gotoh, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
Abstract
A common-mode feedback circuit outputs a control voltage to define a common-mode operating point of a fully differential amplifier. The common-mode feedback circuit has a voltage dividing circuit and a differential amplifier. The voltage dividing circuit divides a voltage across two output ends of the fully differential amplifier. The differential amplifier receives an output voltage of the voltage dividing circuit and a reference voltage, and an output voltage of the differential amplifier is supplied as the control voltage to the fully differential amplifier.