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:
Nov. 02, 2010
Filed:
Jul. 08, 2009
Atsushi Shimatani, Kanagawa, JP;
Atsushi Shimatani, Kanagawa, JP;
NEC Electronics Corporation, Kawasaki, Kanagawa, JP;
Abstract
An input stage of a differential amplifier includes a differential pair formed by an N-channel MOS transistor MNhaving a gate connected to an INM and an N-channel MOS transistor MNhaving a gate connected to an INP, both having sources connected to each other, a constant current source connected to the sources of the MNand MNand a variable current source connected to the sources of the MNand MNA subsequent-stage processing circuit having an intermediate stage and an output stage includes a phase compensation capacitor and outputs an output responsive to a change in the differential inputs by charging and discharging the phase compensation capacitor through the constant current source. The variable current source turns ON when the change reaches a level causing a parasitic capacitor at the sources of the differential pair to be discharged, and supplies a current for discharging the parasitic capacitor.