2010 Volume 7 Issue 23 Pages 1714-1720
In this paper a fully differential comparator-based switched-capacitor (CBSC) pipelined ADC is presented. For better performance and accuracy, we modified the differential architecture and introduced some practical issues on preset levels designing. For comparison, we used a simple comparator which can compensate offset easily. Finally we designed a 12b 40MS/s Fully Differential CBSC Pipelined ADC with proposed architecture in a 0.18-µm standard CMOS process. It achieves 75.2-dB spurious-free-dynamic range (SFDR) and 69.78-dB SNDR. In addition it consumes 4.1mW from a 1.8-V power supply at 40MS/s, which obtains a figure of merit of 460fJ/step.