Supply independent current reference generator in CMOS technology

摘要

A current reference generator including a current network, a bias network, and a loop amplifier. The current network includes first and second transistors of a first conductivity type and third, fourth and fifth transistors of a second conductivity type. The first, third and fifth transistors are series-coupled between voltage supply lines forming a first current path, and the second and fourth transistors are series-coupled between the supply lines forming a second current path. The control terminals of the first and second transistors are coupled together and the control terminals of the third and fourth transistors are coupled together. The bias network biases the fifth transistor. The loop amplifier is coupled to the current network and is operative to maintain constant current level through the first and second current paths independent of voltage variations of the supply lines and at very low supply voltage.