Cascode Current Mirror Circuit. To best understand this important circuit building. The implementation of the current mirror circuit may seem simple but there is a lot going on.
This arrangement is known as a cascode current mirror. This is a cascode current mirror. A current mirror circuit mirror or copy the input current of one active device to the other.
For basic current mirror we can modify the equations by considering channel length modulation.
Higher input output isolation higher input impedance high output impedance higher bandwidth. One way to add emitter resistance without using actual resistors or generating a large voltage drop is to stack one current mirror on top of another as shown to the left. Parasitic resistance rp will lower the output impedance since its parallel combination with ro1 will always be lower than ro1. Assuming that all transistors are idential so that iin equals iout.
