What are the limitations of a current mirror?

Current mirrors have several limitations, including output impedance, which can affect the accuracy of the current replication, particularly in low-voltage applications. They also exhibit a finite output voltage range, limiting the maximum load they can drive without distortion. Additionally, temperature variations can lead to changes in current due to mismatches in transistor characteristics, and they may not perform well with large input current variations, leading to poor linearity and accuracy.