Analyzing a Current Mirror: Finding Rref for Vcc=8V and Icopy=0.38mA

[Cocoleia]

Homework Statement

I am working on this problem. They start out by giving me:

I am asked to find Rref such that Vcc=8V and Icopy=0.38mA.

Homework Equations

Transistor equations

The Attempt at a Solution

In this case, they never specify if IB=0A (sometimes it does ?) but I would assume that it is and therefore beta would be very large and we ignore this.

 

[collinsmark]

That's the answer I got.

 

[CWatters]

In this case, they never specify if IB=0A (sometimes it does ?) but I would assume that it is and therefore beta would be very large and we ignore this.

Right answer but you have the explanation backwards...

Beta is high so the base current is much smaller than the collector current. Therefore the base current can be ignored (but the base current isn't zero).