GSPS轉(zhuǎn)換器寬帶前端設(shè)計(jì)

　　GSPS轉(zhuǎn)換器寬帶前端設(shè)計(jì)

　　隨著變換器技術(shù)的改進(jìn)，同樣需要解決非常高的中頻（IF）準(zhǔn)確，即使在高速。這帶來(lái)了兩個(gè)挑戰(zhàn)：轉(zhuǎn)換器的設(shè)計(jì)本身和前端設(shè)計(jì)，夫婦的信號(hào)內(nèi)容轉(zhuǎn)換器。即使轉(zhuǎn)換器本身是優(yōu)秀的，前端必須能夠保持信號(hào)質(zhì)量。高頻，高速轉(zhuǎn)換器的設(shè)計(jì)存在于今天的許多應(yīng)用中，與雷達(dá)，無(wú)線基礎(chǔ)設(shè)施和儀器推動(dòng)這些邊界。這些應(yīng)用程序需要使用高速，GSPS轉(zhuǎn)換器具有8至14位分辨率。

　　寬帶，本文中所定義的，是使用的信號(hào)帶寬大于100 MHz和范圍內(nèi)的+ 1-4 GHz頻率。在本文中，定義了一個(gè)寬帶無(wú)源網(wǎng)絡(luò)的討論會(huì)，以及突出的是重要的選擇時(shí)，隨著使用當(dāng)前配置的拓?fù)浣Y(jié)構(gòu)，今天的變壓器或巴倫的規(guī)格。最后，考慮和優(yōu)化技術(shù)將被揭示，以實(shí)現(xiàn)一個(gè)可行的寬帶解決方案在GHz區(qū)域。

　　Laying the foundation

　　It is natural to gravitate to GSPS converters for applications such as RADAR， instrumentation and communication observation because this offers a wider frequency spectrum or Nyquist band. However， a wider frequency spectrum poses even more challenges on the front-end design. Just because you purchase a converter with a +1 GHz Nyquist， you still have to wrap the right components around it and pay closer attention to the circuit’s construction， i.e. – front end. Those challenges are escalated when the application calls for +1 GHz super-Nyquist sampling， where spectral information must be captured in the 2nd， 3rd， or 4th Nyquist zone.