Current mirror with improved input voltage headroom

摘要

A novel current mirror is taught which provides improved input voltage headroom. The current mirror provides for the ratioed current mirroring of an input current supplied by a current source while providing an increased voltage level to that current source as compared with prior art current mirrors. This provides a significant improvement over prior art current mirrors which are likely to provide an insufficiently high voltage level to the current source to allow its proper operation, particularly with the trend toward lower supply voltages.