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This paper presents a 12-bit 100-MS/s pipelined analog-to-digital converter designed in a 0.18-mum CMOS process. Unlike conventional pipelined analog-to-digital converters, we use a direct level-signal transition technique to replace the traditional digital-to-analog converter. The designed ADC consumes 43 mW power from a 1.8 V power supply. Simulated static DNL and INL errors are 0.5 LSB and 0.73 LSB, respectively. Compared with the traditional ADCs, our method can reduce up to 80% of transistor numbers.