Discussion
What does a cascoded current mirror improve?
Answer: B
Stacking a second device above each mirror transistor multiplies the output impedance by roughly that device's own gain, so the load no longer limits the stage. Offset, tail stability and common-mode range are separate matters, and the arrangement costs headroom. Applying the cascode idea to the load as well as to the input devices is how the highest-gain integrated stages are built, and both uses rest on the same mechanism.
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