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. 30, 2014
Filed:
Aug. 28, 2012
Taichiro Kawai, Kiryu, JP;
Takashi Tokano, Kumagaya, JP;
Taichiro Kawai, Kiryu, JP;
Takashi Tokano, Kumagaya, JP;
Semiconductor Components Industries, LLC, Phoenix, AZ (US);
Abstract
This invention provides a voltage controlled variable gain amplifier circuit that varies its gain linearly and continuously against a gain control voltage VC. The voltage controlled variable gain amplifier circuit includes a first differential amplifier, a second differential amplifier, a gain control voltage/current conversion circuit and a reference current generation circuit. The first differential amplifier and the second differential amplifier are connected in series. The gain control voltage/current conversion circuit converts the gain control voltage VC into a gain control current IC that varies linearly against the gain control voltage VC. Drain currents Idand Idof first and second differential input transistors vary linearly against the gain control current IC.