This paper presents the design and postlayout simu-lation results of 8-bit analog-to-digital converter (ADC) dedicated to multichannel biomedical integrated recording system. The integrated circuit is implemented in CMOS 40 nm process and has been recently received from fabrication. The proposed ADC is based on charge redistribution technique utilizing only two capacitors. The designed ADC converts analog signals provided from eight chopper based amplifiers, achieves sampling rate up to 1 M S / s and occupies only 0. 0033m m² of silicon area. The peak DNL and INL are −0.6 and −1.4 LSB respectively. This paper presents particular blocks' detailed analysis as well as their postlayout simulation results.