Yamaji Takafumi    Department   SOJO UNIVERSITY  Department of Computer and Information Sciences, FACULTY OF COMPUTER AND INFORMATIONSCIENCES      /(DC)Division of Applied Information Sciences, Graduate School of Engineering      /Division of Applied Information Sciences, Graduate School of Engineering    Position
Country of acquisition	Foreign country (米国)
Patent No.	USP 6,437,643
Date of Grant	2002/08/20
Inventor	Ueno; Takashi (Kawasaki, JP), Arai; Tadashi (Yokohama, JP), Yamaji; Takafumi (Yokohama, JP), Yoshida; Hiroshi (Yokohama, JP), Itakura; Tetsuro (Tokyo, JP)
Patent Title	Variable gain amplifier
Details	A variable gain amplifier comprises a main amplifier circuit whose gain is controllable and which amplifies a difference signal between an input signal and a feedback signal, a feedback amplifier circuit whose gain is controllable and which amplifies an output signal of the main amplifier circuit, and a gain control circuit which complementarily control the gain of the main amplifier circuit and the gain of the feedback amplifier circuit.