A Novel and Reliable High accurate High lineaer Very low power and High speed Continuous-time Common-Mode Feedback Circuit in 0.18μm CMOS

a new method to design continuous-time Common-Mode Feedback Block (CMFB) circuit is presented in this paper. The most challenges in the proposed idea are to increase the speed and linearity, decrease the settling time error and improve the output swing of the common-mode feedback circuit. Therefore, by applying the worst case simulation (initial condition 0 and 1.8 volts) on the proposed CMFB circuit, the output voltage can be settled in the desired level just after 1.66ns. Moreover, the proposed CMFB has a wide dynamic rangevoltage to set the output in the preferred value as well. Meanwhile, as MATLAB simulation result demonstrates that by applying the reference voltage (Vref) from 0.55 to 1.35 volts the suggested circuit be able to adjust the output value in the suitablelevel with low error properly. Furthermore, the mentioned structure is a good choice for low voltage application too. The power consumption of the proposed common-mode feedback circuit is just 123μW with the power supply of 1.8 volts, and 0.5pF capacitor load is applied at the output nodes of the amplifier. Finally, the proposed circuit is simulated in whole process corner and different temperatures in the region from -45℃ to +110℃. Simulation results are performed using the HSPICE BSIM3 model of a 0.18μm CMOS technology and MATLAB software.

Keywords:

amplifier , Common-mode feedback , low voltage , folded cascode , high speed , Monte Carlo