Design and Comparison of Noise, Power of Resistive, RC and Capacitive feedback TIAs for RF Receiver Application

This paper presents a design of two stage miller compensated operational amplifier (Op-amp) which is used as a voltage amplifier stage for the design of a Transimpedance Amplifier (TIA) for NB-IoT RF receiver application. Further the work involves comparison of conventional TIAs such as resistive feedback TIA, RC feedback TIA and Capacitive feedback TIA with respect to input referred current noise and power dissipation as per the application requirement. To achieve better stability, low power consumption and constant gain the two stage miller compensated Op-Amp is designed as an voltage amplifier. The TIAs are designed with a transimpedance gain of 54 dBΩ with phase margin of 70°. Among the three topologies of TIA the capacitive feedback topology outperforms the resistive and RC feedback topologies in reference of input referred current noise which is about 0.13 pA/√ Hz and it is the lowest noise achieved design compared to the recent works as well. However it is observed that resistive and RC feedback TIAs are most suitable for low power applications compared to capacitive feedback TIA as it dissipates low power of 1.36 mW for overall circuit and in which Op-amp consumes 90 μW from 1.2 V power supply. The circuits are designed and simulated in TSMC 65 nm low power CMOS technology.