Low Power Folded Cascode Cmos Operational Amplifier with Common Mode Feedback for Pipeline Adc

This work proposed a low power and high gain folded cascode CMOS operational amplifier with a common mode feedback (CMFB) for Pipeline ADC. The proposed design is implemented in 0.13-μm Silterra CMOS technology. The folded cascode topology has been used for obtaining a high gain and low power consumption. Meanwhile, the CMFB is modified circuit to be a double detection to stabilize the output of common-mode voltage. The simulation results shown that the DC gain of 64.5dB, unity gain bandwidth (UGB) of 133.1 MHz and a phase margin (PM) of 68.4o have been achieved. The power consumption of 0.3mW in 1.8V power supply with 22.6V/μs of slew rate and 72.4ns of settling time is obtained.