A dynamic start-up circuit for low voltage CMOS current mirrors with power-down support

In this paper, a dynamic start-up circuit for advanced bias circuits is presented. This start-up circuit supports both power-down and power-on-reset inputs for more stable functionality, satisfying the demand of low power dissipation in suspend mode. The dynamic operation of this circuit minimizes power dissipation especially when low power design is necessary. Complete analysis of this circuit is performed to help designers with device sizes and different effects of circuit parameters. HSPICE simulations are provided to show the proper functionality and validity of this circuit using 0.18 μm CMOS technology in 1.8 V.