In this paper, the current mirror presented, having low voltage and mixed mode structure has been proposed. The performance of self-cascade MOSFET current mirror is optimized with high output impedance and can operate at 1 V or below. This review paper presents a comparative performance study of self cascode current mirror with other current mirrors.To meet the need of the present era of low power portabale electronic equipment, many voltage design technique has been developed. This led to analog designers to look for innovative design technique such as self-cascade CMOS current mirror. In this paper investigate the merits and demerits of various current mirror circuit. For this first, develop basic current mirror and then cascode current mirror, Wilson current mirror and finally current mirror based selfcascode current mirror. The result is analyzed through spice simulation