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. 22, 2005
Filed:
Mar. 15, 2005
Kouichi Matsushita, Komoro, JP;
Tomio Furuya, Sawa, JP;
Fuminori Morisawa, Kawagoe, JP;
Takayuki Tsutsui, Saku, JP;
Nobuhiro Matsudaira, Chigasaki, JP;
Kouichi Matsushita, Komoro, JP;
Tomio Furuya, Sawa, JP;
Fuminori Morisawa, Kawagoe, JP;
Takayuki Tsutsui, Saku, JP;
Nobuhiro Matsudaira, Chigasaki, JP;
Renesas Technology Corp., Tokyo, JP;
Hitachi Communication Systems, Inc., Kanagawa, JP;
Abstract
A module including a bias circuit that generates gate bias voltages by resistance dividers creates a problem in that the values of the resistances constituting the bias circuit must be finely adjusted, and accordingly extra trimming tasks are required. The present invention provides current generators that generate currents varying with desired characteristics responsive to a control voltage, independent of variations in transistor threshold voltages, connects output resistors to parallel transistors in respective stages to form current mirror circuits, and supplies currents from the current generators thereto to drive them, instead of supplying dividing voltages.