Design and Simulation of a CMOS Current Source Cell

This paper presents a voltage threshold-based self-bias and can be used for integrated CMOS current source structure. When the power supply voltage change from 3 V to 6.5 V, the current source can output 20 current constant currently and enable control terminal also be added that can effectively control the circuit open or closed. After pre - simulation achieve the desired effect we designed and verified the lay- out, then extracted the parasitic parameters and used it with the HSPICE software finish the layout simu- lation. The circuit can be good for the other sub-circuit modules to provide a stable DC bias, so that they can work in a suitable quiescent point.