In this paper, the design and implementation low power current steering digital to analog converter in 45nm technology using CMOS and GDI logic using Tanner Tool, V15 is presented. This architecture gives the most optimized results in terms of speed, resolution and power. The designed 10-bit DAC operates with two supply voltages, 1V and 3.3V. The simulation result shows the transient analysis waveforms of current steering DAC. The average power dissipation 1.40mW using GDI logic and 2.63mW using CMOS logic. The tool used for simulation is Tanner S-edit and T-Spice.