Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Chien-Ming Chen0
Wei-Liang Lee0
Chih-Chien Huang0
Date of Patent
October 13, 2009
Patent Application Number
12056328
Date Filed
March 27, 2008
Patent Primary Examiner
Patent abstract
A variable gain amplifier circuit has an amplifier, a string of resistors, a plurality of gain switches, a current source, and at least two current switches. A first input terminal of the amplifier receives an input voltage signal. The string of resistors are coupled between an output terminal of the amplifier and a bias voltage input terminal. Each of the gain switches is coupled between a second input terminal of the amplifier and one of connection nodes between two of the resistors. Each of the current switches is coupled between the current source and one of the connection nodes. The current source provides a current through the turned-on current switch.
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