Reconfigurable Multi-Mode Sigma Delta Modulator for 5G Applications

This paper presents a system level design of a reconfigurable multi-mode continuous-time low-pass sigma delta modulator for 5G applications. The proposed modulator can support multiple channel bandwidths in the 5G standard which are 80, 40, 20, and 10 MHz. The proposed modulator can be reconfigured easily for each channel bandwidth so that it can achieve the optimum performance in each mode. Moreover, the proposed modulator has a signal transfer function with a very slight peaking. The system level design and Simulink simulation results of the proposed modulator are presented. Furthermore, a circuit behavioral model that includes most of the circuit non-idealities is implemented and simulated in Cadence environment. The results show that the signal to noise and distortion ratio is 75.2 dB, 76.6 dB, 76.7 dB, and 77.6 dB for the channel bandwidths 80, 40, 20, and 10 MHz respectively.