Nano-ampere CMOS current reference with little temperature dependence using small offset voltage

In this paper, we propose a low-power current reference circuit with little temperature dependence for micro-power electronics applications. The current reference circuit consists of a bias-voltage subcircuit, a current-source subcircuit, and an offset-voltage generation subcircuit. The offset-voltage generation subcircuit is used to compensate for temperature dependence of the reference current. A SPICE simulation demonstrated that the circuit generates a 93-nA current, and the total power dissipation is 811 nW. The temperature coefficient of the reference current can be kept small, i.e., within 288ppm/°C, in a temperature range of -20 to 100°C.