Common source FET RF amplifier

Discussion in 'General Electronics Chat' started by yaantey, Sep 27, 2014.

  1. yaantey

    Thread Starter Member

    Oct 7, 2011
    47
    0
    I am wondering how the signal gets amplified in ATF-58143 amplifer. I mean why does a signal input at gate gets amplified at drain. From what I understand in a FET a gate voltage is used to control the current flow from source to drain.

    Thanks
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Any amplifier can have voltage gain, current gain, and/or power gain. Rf amplifiers are usually described as having power gain.
     
  3. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Just pretend it's a bipolar transistor with a really high base impedance. Wiggles on the base (gate) voltage cause wiggles in the drain current, and that causes voltage wiggles across the drain resistor.

    Yes, I invented a new word for "change in". :D
     
Loading...