Quick question: What are some disadvantages to the Wilson current mirror?

Discussion in 'Homework Help' started by hrstar24, Dec 13, 2010.

  1. hrstar24

    Thread Starter Active Member

    Apr 7, 2009
    I found the Rout of the Wilson current mirror, and found that it is much larger than that of the regular current mirror. So one disadvantage would be that a lot more power needs to be used from Vcc to drive the circuit, right? Are there any other disadvantages?
  2. hgmjr

    Retired Moderator

    Jan 28, 2005
    I don't think of the Wilson Current Mirror as more power hungry than the more general case of the current mirror. The main disadvantage is the use of one more transistor than the general current mirror circuit. The extra transistor does eat up some additional headroom.

    On the plus side, for the added transistor, you get a more accurate current mirror.

    hrstar24 likes this.