Darlington Pair Amplifier

Discussion in 'The Projects Forum' started by dswartz2, Dec 10, 2009.

  1. dswartz2

    Thread Starter Active Member

    May 19, 2009
    31
    0
    hello,

    I am trying to design a multistage amplifier using a darlington pair transistor. My total gain that I am trying to amplify is 160. My load is 40ohm and the input resistance is 120kohm.

    The darlington pair is triggered by a very low current, which is why I want to use it in the first stage, because of the high input resistance. The darlington pair has a gain of 1. So if I want to only use 2 total stages, the next stage would have to have an amplifier with a gain of 160. Which amplifier should i use in this situation? (common emitter, common source, with full bypass, partial, or no bypass)

    Thanks
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Do you have to build it only by using transistors?

    Are you allowed to use op amps?

    What is the supply voltage?

    What is your input voltage?

    What is the operating frequency?

    What will be the application?
     
  3. dswartz2

    Thread Starter Active Member

    May 19, 2009
    31
    0
    Yes only transistors. I'm trying to use BJT npn transistors or JFET n channel transistors.

    not allowed to use op amps (unfortunately)!

    supply voltage is whatever I need. I was using Vcc = 20V

    input voltage is 20mV pk-pk

    frequency is whatever I need

    There is no specific application. I just need an amplifier in the least amount of stages possible to satisfy the following parameters:

    Av=160
    Zin=120kohm
    Zload=40ohm
    Vsource=20mV p-p

    I wanted to use the Darlington because I figured I could do it in 2 stages
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If you figured it then post your work.
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Ever look at a Sziklai Pair? They have all the advantages of Darlington's, and miss some of the disadvantages.
     
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