A >150dB dynamic range, enhanced input swing, high precision current mirror in 180nm CMOS technology

A high input voltage headroom current mirror is presented. The proposed architecture takes advantage of all modes of operation of the input and output transistors for current recopy (from deep subthreshold to saturation and triode mode) by controlling the gate and drain voltages of the mirror transistors separately. This allows the output and input impedances to always match the input current, thus greatly increasing current recopy accuracy across more than 150db of dynamic range. This technique also allows for a low impedance at high current inputs, resulting in a 531mV input voltage headroom gain compared to a same size classic architecture.