一种改善宽带 DDS 带内平坦度的设计方法

摘要

This paper establishes wide‐band direct digital synthesizer (DDS) based on the method of field programmable gate array (FPGA)+digital to analogue converter (DAC) ,presents the method using coarse adjustment of one‐level equalizer + exact adjustment of one‐level in‐band amplitude coefficient emendation to improve in‐band flatness ,w hich provides reference value for the applica‐tion of large instantaneous wide‐band to various situation .%基于现场可编程门阵列（FPGA ）加数／模转换器（DAC ）的方式构建了宽带直接数字合成器（DDS ），提出了用一级均衡器粗调加一级带内幅度系数校正精调的方式来改善带内平坦度的方法，为大瞬时带宽信号在各种场合的应用提供了参考价值。