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:
Aug. 11, 2009
Filed:
Jan. 28, 2008
Yoshiteru Ishimaru, Tenri, JP;
Motoko Furukawa, Nara, JP;
Yoshiteru Ishimaru, Tenri, JP;
Motoko Furukawa, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A bias circuitin a power amplifieris provided with a VBE-controlled voltage source circuitand a Nagata current mirror circuitThe Nagata current mirror circuitincludes a transistor Trand a transistor TrThe transistor Trhas its emitter grounded, its base connected to a control input terminalvia a resistor Rand its collector connected to that base via a resistor RThe transistor Trhas its emitter grounded, its base connected to the collector of the transistor Tr, and its collector connected to the base of the transistor TrThe arrangement is capable of compensating both the temperature characteristics of the gain of the power amplifierand the control input voltage characteristics of the gain of the power amplifierIn other words, the arrangement is capable of reducing the temperature dependence and control input voltage dependence of the gain of the power amplifier