數(shù)字下變頻技術(shù)作為高速數(shù)字信號(hào)處理的關(guān)鍵核心技術(shù)之一，在中頻數(shù)字化接收機(jī)中起著至關(guān)重要的作用。本文介紹了可編程數(shù)字下變頻器件HSP50216 的特點(diǎn)、內(nèi)部結(jié)構(gòu)和功能模塊，及其在中頻數(shù)字化接收機(jī)中的應(yīng)用，大大地降低了采樣頻率和數(shù)據(jù)量，減輕了對(duì)DSP 計(jì)算需求的壓力。另外由于其強(qiáng)大的可編程能力使得接收機(jī)的設(shè)計(jì)變得更為靈活和方便。
關(guān)鍵字：數(shù)字下變頻器；中頻數(shù)字化接收機(jī)；軟件無線電
Abstract: Digital Down Converter technology is a key of high-speed digital signal processing which is very important in the digital IF receiver. The paper presents the feature, the block diagram and the functional description of the HSP50216 type Digital Down Converter in details, and then its application in IF receiver is given which reduce the sampling frequency and pressure of DSP. In addition, it makes the design of receiver more effectively and conveniently for its strong programming ability.
Keywords: Digital Down Converter; IF Digital Receiver; Software Radio