Comparison of gate-driven and bulk-driven current mirror topologies

In this paper, different topologies of gate-driven and bulk-driven current mirrors designed in 90 nm CMOS technology are presented. Since the conventional MOS transistors can work as a bulk-driven device, there is no need for any modification of the existing MOSFET structure or technology process. The bulk-driven current mirror is capable of operating at power supplies down to the threshold voltage of a standard MOS device. Bulk-driven current mirror topologies were compared to their gate-driven equivalents in terms of main properties and output characteristics. The achieved results prove that the bulk-driven design technique is very promising towards ultra low-voltage analog ICs.