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. 14, 2006
Filed:
Jun. 23, 2005
Alberto O. Adan, Ikoma, JP;
Alberto O. Adan, Ikoma, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A variable gain amplifier circuitincludes an amplifier A, an amplifier A, an inductor L, and an inductor L. The amplifier Ahas a predetermined gain and is connected at a terminal to a circuit output section. The amplifier Ahas a different gain from the amplifier Aand is connected at a terminal to the circuit output section. The inductor Lis connected at an end to a circuit input section and at the other end to the input terminal of the amplifier A. The inductor Lis connected at an end to ground and at the other end to the input terminal of the amplifier A. The inductors Land Lform a transformer T. The configuration restricts input impedance variations which are dependent on the signal path taken by an input signal Vin. The input impedance and the signal source impedance remain matched. Impedance matching is preformed with the signal source with variable gain.