Delta Sigma Modulation Based Digital Transmitter for Single and Dual Band Transmission

Abstract

This paper presents the design and implementation of delta sigma modulator (DSM) based transmitter for single and dual band transmission. This type of architecture is useful for multi-band transmission in carrier aggregation, which is key requirement in upcoming 4G-5G communication. 2nd, 3rd and 4th order multi-level DSM is used to evaluate the performance of transmitter in simulation and hardware for single and dual band transmission. LTE 5 MHz signals are used to validate the results. Measurement results shows that coding efficiency (CE) is improved by 4.48% to 13.45% in single band and 10.44% to 23.65% in dual band by increasing the order of bi-level DSM from 2nd order to 4th order. To further improve the CE, quantization levels of 4th order DSM are increased from 2 to 4, which results in improvement of CE from 13.45% to 65.12% in single band and from 23.65% to 49.42% in dual band.