question

Discussion in 'General Electronics Chat' started by sunil_r_sp, May 21, 2007.

  1. sunil_r_sp

    Thread Starter Member

    Feb 18, 2007
    13
    0
    A normal voltage or curent amplifier provides power gain...then why do we go for power amplifiers for increased power ? cant we use a cascaded amplifier stage to achieve the required power ?
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,179
    1,800
    Amplifiers can be designed for different purposes. There are different topologies which all have different characteristics. For example a Class A amplifier tries to always stay in its linear range. It makes a very poor power amplifier because it is inefficient and consumes bias currents. On the other hand a class AB push-pull amplifier does a much better job. There are several other classes of amplifiers, and you should research this topic to gain a better understanding of the issues.
     
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