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:
Dec. 20, 2005
Filed:
Nov. 13, 2003
Applicants:
Sadao Kotera, Kusatsu, JP;
Hiroshi Taniguchi, Sagamihara, JP;
Inventors:
Sadao Kotera, Kusatsu, JP;
Hiroshi Taniguchi, Sagamihara, JP;
Assignee:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F003/191 ;
U.S. Cl.
CPC ...
Abstract
A tuner circuit includes a variable attenuator circuit including a PIN diode, disposed upstream of a variable-gain amplifier circuit and controlled according to the same AGC voltage used to control the variable-gain amplifier circuit. The operations of the variable-gain amplifier circuit and the variable attenuator circuit in relation to the AGC voltage are set such that when an input RF signal is at a maximum assumed level, a direct current that flows through the PIN diode will be less than a value of a direct current that maximizes intermodulation distortion.