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:
Mar. 10, 2009
Filed:
Feb. 28, 2007
Kouichiro Yamaguchi, Tokyo, JP;
Kouichiro Yamaguchi, Tokyo, JP;
Icom Incorporated, , JP;
Abstract
A variable gain amplifier includes signal amplifying transistor and first and second gain control transistors at output and non-output sides, whose emitters are connected to collector of signal amplifying transistor. The amplifier includes non-output load provided between collector of second gain control transistor and a power source, and equal to output load connected between collector of first gain control transistor and the power source. The amplifier includes non-output side negative feedback path provided between collector of second gain control transistor and an input terminal of signal amplifying transistor, and formed in same circuit form with same circuit constant as a negative feedback path running from an output terminal of first gain control transistor to the input terminal. The amplifier includes current dividing circuit which divides biasing currents between the two paths to flow the currents at same ratio as the current division ratio between first and second gain control transistors.