Using DTMOS technique in the design of common mode feedback in a 0.8 V folded cascode amplifier

A continuous time common mode feedback (CMFB) technique for sub 1-V analog circuits using the bulk PMOS dynamic threshold (BP-DTMOS) technique is presented. The proposed method is used in a 0.8 V folded cascode amplifier. The amplifier with embedded CMFB is implemented in 0.18 /spl mu/m CMOS technology. The measurement data as well as simulation results are presented in this paper. The measurement results show that this technique improves the CMRR by 12 dB and helps reduce the common mode errors caused by process or environmental variations.