文章介紹了DDS 技術(shù)的工作原理和AD9954 的結(jié)構(gòu)，設(shè)計出了400MHZ 信號源電路圖，并給出了部分程序。測試結(jié)果表明本設(shè)計具有頻率分辨率高，功耗低，輸出頻率信號相位連續(xù)，頻率轉(zhuǎn)換時間短等優(yōu)點。該信號源結(jié)構(gòu)簡單，廣泛用于通信、儀器儀表、
自動控制等領(lǐng)域
關(guān)鍵詞： AD9954；高頻信號源；電路；串行操作
Abstract: The paper introduces the principle of DDS and the structure of AD9954 , designs a
400MHz signal source circuit, and a part of program is given .The test result indicates that this
design have many excellence performance, such as high frequency resolution, low power cost,
output frequency signal continuous and the time of frequency-shift short. The signal source
has simple structure, and can be used in communication ,equipment and meter, auto-control
extensively.
Key words: AD9954; high frequency signal source; Circuit; Serial operation