A Design of Digital Phase Shifter by Implementing Frequency Translation for WCDMA using XILINX

Abstract

This paper presents a design of Digital Phase Shifter implementing frequency translation in WCDMA system. A shifting process in digital data is very important to make sure the translated data is shifted correctly into register without missing any data. The design is focusing on the digital phase shifter where it is usually comprised in direct digital synthesizer (DDS) which then utilizes every digitized waveform signals stored in the register. The digitized signals will then shifted according to the designed algorithm so that every data will follows its sequence and shifted as desired. Algorithm of the design is written in VHDL programming Language which then simulated using Modelsim SE 6.3f. The simulated algorithm generates a waveform that shows the data are shifted accordingly by mapping the entire written block diagram. Using XILINX ISE simulator will then synthesized the block diagram of the whole digital phase shifter design utilization. Keywords-component; Wideband Code Division Multiple Access (W-CDMA), Direct Digital Synthesizer (DDS), Register Transfer Level (RTL), Lower Side Band (LSB) .