Need for Current Mirror

Discussion in 'General Electronics Chat' started by sivaraj, Oct 12, 2007.

  1. sivaraj

    Thread Starter New Member

    Oct 8, 2007
    Hai i am sivaraj.
    * can any tell mi the function or how current mirror works exactly....
    *diff. between PMOS and NMOS Current Mirror
  2. Dave

    Retired Moderator

    Nov 17, 2003
    We have an article on current mirrors here at AAC however it focuses on BJTs:

    To quote: "A current mirror is a transistor circuit that regulates current through a load resistance, the regulation point being set by a simple resistor adjustment."

    For the MOSFET current mirror, the fundamentals are the same however you need to be familiar with the analogies of BJTS and MOSFETS to use the above AAC section. The wiki on current mirrors will give you an appropriate insight:

    The difference between a PMOS and NMOS current mirror is that in one implementation p-type MOSFETs are used as the active devices for mirroring and in the other implementation n-type MOSFETs are used as the active devices for mirroring.

    I would suggest that you read the above articles and post back with specifics if you require further help.