why calculate gain and voltage swing of a current mirror?

[kidmanbasha]

calculating gain with voltage and current

How does the gain and voltage swing make a difference in a current mirror?

 

[antonio_eda]

basic current mirror, how to find gain

Current mirrors are simple elements of complex bias or load systems. If for example, you need somewere in your circuit a double of the reference current, you may use a simple current mirror with the gain=2. If this is the bias current for a differential pair --- the output swing of the current mirror is important for working regions of the diff amp.

Very clear chapter about current mirrors you can find in Razavi's handbook.

 

[Sadegh.j]

calculation of voltage swing

the voltage swing determines the head room for the swing of the other parts