Output Stage Questions

Discussion in 'General Electronics Chat' started by crazyengineer, Jan 8, 2012.

  1. crazyengineer

    Thread Starter Member

    Dec 29, 2010
    So I was reading more about output stages using BJTs, but I'm a little confuse about the following

    1) Do output stages just add a current to vin of the output stage (e.g. push-pull output stage).
    2) Is it possible to build output stages using mosfets? I just find it easier to bias mosfets than BJTs.

    I'm sorry for the stupid questions, but I just want to confirm a couple things.
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    Output stages typically produce a very low impedance/high current output at the voltage needed for the power required.

    There are many amplifiers with MOSFET outputs, as they are essentially voltage controlled current sources, while a BJT is a current controlled current source.

    This link covers HEXFET outputs

    While The entire site has tons of extremely useful and valuable information about audio electronics amplification, from pre-amps to speakers.
  3. PaulEE


    Dec 23, 2011
    P.S. - Those questions were not stupid. If you have a question, don't think twice with regards to feeling embarassed/"stupid"/etc., nobody learns if nobody questions.