Dynamic Switching Compensation Technique Mitigating Code-Dependent Switching Distortion in CS-DACs

A dynamic switching compensation (DSC) technique is proposed in this paper for current steering Digital-to-analog converters(CS-DAC). This technique addresses the code-dependent non-linearity based on switching distortion in high frequency CS-DACs. Here, the DSC technique is applied using two pairs of differential switches in unit current cell structure, which randomly selects each pair of the current switches. This achieves the code-independent switching by effectively reducing the distortion caused due to mismatch between current switches. A 10-bit CS-DAC is designed in 180nm CMOS technology using DSC technique adopt 60% segmentation ratio. The simulation results are obtained using mismatch based simulations, which shows more than 68dB spurious-free-dynamic-range (SFDR) for low input signal frequencies. The simulated power consumption of this DAC is 42mW for a single 1.8V supply.