A Clock-less 8-bit folding A/D converter

This paper presents a continuous-time 8-bit folding analog-to-digital converter. The clock-less architecture is composed of 8 identical stages with 1 bit/stage. The circuit is designed in a 350nm CMOS process with a supply voltage of 3.3V. Simulation results show that the 8-bit clock-less ADC can achieve a Signal-to-Noise and Distortion Ratio of 53dB. The ADC has a power consumption of 5.51mW. The proposed circuit is compared with a similar continuous-time 8-bit pipeline ADC with 1 bit/stage.