Using a current mirror to create multiple copies, multiples, or fractions of a reference current
Once the base / gate voltage is generated from the reference current $I_{ref}$ generated by a Band Gap Reference circuit, it can be used to create multiple copies of the current of higher, lower or equal values. This is best explained with a few reference diagrams.
Creating multiple copies
Creating one copy but with higher multiple of current
Creating one copy but with fractional multiple of current
Creating multiple copies with higher and fractional multiples of current
