Current Mirrors - FET vs BJT

165

02:52:41

This makes me laugh, because while the MOSFETs struggle, the BJTs are like, "Problem? What problem?"

50kRin, 20kRout
  bjt wins, no contest!
20kRin, 50kRout:
  neither cope
20kRin, 20kRout:
  bjt again wins, no contest!
20kRin, 10kRout:
  again with the bjt winning! lol
20kRin, 5kRout:
  ditto

published 7 years ago

hurz

7 years ago

While BJTs in everycircuit model do not have any Earlyeffect, we can or must tune mosfet lambda to zero to be compareable with BJTs. Hope this helps http://everycircuit.com/circuit/6388750799339520

jason9

7 years ago

Yes. It seems that if lambda is equal to zero, then the MOSFETs create an ideal current mirror, which is no surprise if you think about it.

hurz

7 years ago

But the more realistic case is earlyvoltage for BJTs and a little lambda for mosfets (if you use mosfets ever in your life for linear operation)

Rinat84

7 years ago

У базовых токов один выход + различие сопротивлений каналов и быстродействий транзисов

eekee

7 years ago

Ah, so the Early effect would affect this. I see. Lambda can realistically be lower? Good to know.

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