An Ultra High speed Low power Low settling time error and wide dynamic range voltage Continuous-time Common-Mode Feedback Circuit in 0.18µm CMOS

Abstract

A novel method to design continuous-time common-mode feedback circuit is presented in this paper. The main purposes of the proposed idea are increasing the speed and decreasing the settling time error of the common-mode feedback circuit, besides it has a wide dynamic rang voltage to set the output in desired value as well. As MATLAB simulation result shows the proposed circuit can adjust the output in reliable value by applying the reference voltage (Vref) from 0.7 to 1.3 volt very well. Also, the mentioned structure is a proper choice for low voltage application too. The power consumption of the proposed common-mode feedback circuit is just 200µW with power supply of 1.8 volts, and 0.5pF capacitor load is applied at the output nodes of the amplifier. Meanwhile, the proposed circuit is simulated in whole process corner too. Simulation results are performed using the BSIM3 model of a 0.18µm CMOS technology and MATLAB software.