AD9857 是一款功能強(qiáng)大的可編程數(shù)字上變頻器，高速的處理速度、精確的載波
頻率和靈活的數(shù)字控制使得它廣泛應(yīng)用于通信、雷達(dá)、導(dǎo)航等各個(gè)領(lǐng)域。本文介紹了該上變頻器的用法和功能，給出了與DSP 進(jìn)行傳輸?shù)?a target='_blank' class='arckwlink_none'>接口連接和寄存器配置。結(jié)合軟件無(wú)線電的思想，設(shè)計(jì)一個(gè)可以按照用戶需要靈活更改載波頻率和調(diào)制方式的雙路音頻無(wú)線傳輸系統(tǒng)。
關(guān)鍵字：AD9857；數(shù)字上變頻器；獨(dú)立邊帶；軟件無(wú)線電
Abstract：AD9857 is a set of powerful programmable digital upconverter with so many
advantages. It has a high speed of processing. The carrier frequency made from inside DDS core is very precise and it is also easier and flexible to control it in digital way. It is because of so many excellent qualities that AD9857 is widely used in different kinds of fields such as communication, radar, navigation and so on. This article makes an introduction of this chip’s usages and functions. The interface used to communicate with DSP and the setting of its inside registers are also included. With the idea of software radio, the design of a double-path audio wireless transmission system which is easy to change the carrier frequency and the mode of modulation is also given.
Key words: AD9857; digital upconverter; ISB; Software Radio