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:
May. 11, 2010
Filed:
Oct. 01, 2008
Hirotoshi Tsuchiya, Fukuroi, JP;
Shinji Yaezawa, Hamamatsu, JP;
Yuya Hashimoto, Hamamatsu, JP;
Toru Nakamori, Hamamatsu, JP;
Tatsuya Kishii, Iwata, JP;
Hirotoshi Tsuchiya, Fukuroi, JP;
Shinji Yaezawa, Hamamatsu, JP;
Yuya Hashimoto, Hamamatsu, JP;
Toru Nakamori, Hamamatsu, JP;
Tatsuya Kishii, Iwata, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
A differential amplifier includes: a constant current source; first and second field effect transistors whose respective gates are imparted with positive-phase and negative-phase input signals and whose sources commonly connected to each other, the constant current source being connected to a common node of the sources; first and second loads serving as current paths for respective drain currents of the first and second field effect transistors; an amplifying unit which outputs positive-phase and negative-phase output signals which are amplified in response to the respective drain voltages of the first and second field effect transistors; and a current path generator which generates first and second current paths parallel to the respective first and second field effect transistors for a predetermined period of time at the time of start-up of the differential amplifier.