Patent ID: 7209004
Filing Date: 2007-04-24
Classification: H03G

Abstract:
1. A wide band variable gain amplifier (VGA) stage for amplifying or attenuating an input signal that is transmitted via a transmission line (H) comprising: an operational amplifier for amplifying the input signal; a feedback resistor connected to said operational amplifier and formed as a first series strip resistor having a first number of taps; an input resistor arranged at an input of the VGA stage for attenuating the input signal and formed as a second series strip resistor having a second number of taps; and a control device for switching said feedback resistor and said input resistor; wherein said operational amplifier comprises a first operational amp portion for a positive half wave of the input signal and a second operational amp portion for a negative half wave of the input signal; said feedback resistor comprises a first feedback resistor portion connected to said first operational amplifier portion and a second feedback resistor portion connected to said second operational amplifier portion; and said input resistor comprises a first input resistor portion connected to an input of said first operational amplifier portion and a second input resistor portion connected to an input of said second operational amplifier.