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This paper presents a 12-bit 50-MS/s pipelined SAR analog-to-digital converter (ADC) with loading-separating technique. The proposed loading-separating technique relaxes output loading of multiplying digital-to-analog converter (MDAC) and increases the time budget of bit cycling for the 2nd stage. In addition, a split-path amplification MDAC is proposed to enhance amplifier's gain and bandwidth. The ADC core occupies an active area of 0.27 mm2 in TSMC 90-nm 1P9M CMOS process. The measured results show that the proposed ADC achieves 63.56 dB SNDR with 2.17 mW power consumption.