Novel Low-Power OTA using New Block to Eliminate Common-Mode Signal

Objective: In this paper, a trans-conductance amplifier based on Common Mode Rejection Ratio (CMRR) enhancement block is presented. The proposed block is capable of eliminating common mode signals at input stage. This feature improves the gain and CMRR of the amplifier substantially. The Cascode structure is also eliminated in proposed architecture, which resulted in favorably reduced power consumption due to low supply voltage requirements. Materials and Methods: The presented OTA is simulated in ۱۸۰nm CMOS technology at Cadence Spectre environment with ۱.۵ v supply voltage proving it appropriate for low-voltage applications. The bias current of the proposed circuit is very low value of ۳.۹ μA. Results: Gain and phase margin for this block are achieved to be ۸۳.۹۶ dB and ۶۱.۶۸ degree, respectively. These results achieved while the circuit drive a ۵pF load at its output. The power consumption of the proposed amplifier is interestingly very low value of ۵.۹ μW. Conclusion: It is interestingly concluded that the achieved specifications makes the block very much suitable for low-power applications.

کلیدواژه ها:

CMRR Enhancement ، High gain ، Low power ، Trans-conductance amplifier