Author Topic: Use of current mirror  (Read 1528 times)

0 Members and 1 Guest are viewing this topic.

Offline ShadowReaper

  • Contributor
  • Posts: 10
  • Country: gr
Use of current mirror
« on: May 08, 2013, 02:06:43 pm »
Hello,
as you already know, the current mirror provides a circuit with a current which is equal to the referenced current (Iref).
My question is: why don't we just use the Iref itself to power the circuit and we use the mirrored current?
 

Offline w2aew

  • Super Contributor
  • ***
  • Posts: 1735
  • Country: us
  • I usTa cuDnt speL enjinere, noW I aR wuN
    • My YouTube Channel
Re: Use of current mirror
« Reply #1 on: May 08, 2013, 02:12:51 pm »
Hello,
as you already know, the current mirror provides a circuit with a current which is equal to the referenced current (Iref).
My question is: why don't we just use the Iref itself to power the circuit and we use the mirrored current?

Often times, current mirrors are used to supply the same magnitude current to different circuits/loads.  One reference can be mirrored many times to create many current sources tied to the same reference. Also, current mirrors can scale the reference current, thus creating current sources that are larger or smaller in magnitude by easily controlled ratios.
======================================
YouTube channel: https://www.youtube.com/w2aew
FAE for Tektronix
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf