Title: Variable gain amplifying circuit and relative method
Application Number: 200510118163 Application Date: 2005.10.26
Publication Number: 1750391 Publication Date: 2006.03.22
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03G3/20
Applicant(s) Name: Weisheng Electronic Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: huang xiaolin wang zhisen
Abstract:
     This invention provides a variable gain amplifying circuit and its related method, which provides a variable reference current according to the value of a control-signal, then divides the reference current into a load current and an input control current based on the differential drive between the control-signal and the constant value reference signal to bias the input circuit and the load circuit of the amplifier to control the gain with the ratio between the two currents, therefore, the control signal value can be used to regulate the gain.
Time: 12