越小越好：小型化射頻- 2部分

　　這篇文章，兩個(gè)部分的第二部分，探討了一些關(guān)鍵的有源元件和系統(tǒng)元件的小型化，將允許下一代無線鏈路的設(shè)計(jì)者提供更小，更高效的無線電和無線電子系統(tǒng)。我們將研究小型有源元件，如RF晶體管，混頻器，調(diào)制器和放大器，并將討論芯片形式的設(shè)備是有用的系統(tǒng)芯片（SoC）和多芯片模塊（MCM）的風(fēng)格原型和初始生產(chǎn)運(yùn)行。

　　第1部分介紹了最新的小型無源元件，集成了幾個(gè)離散部分成較小的表面貼裝版本。這些節(jié)省空間，成本，提高性能，并廣泛使用與現(xiàn)代，共同標(biāo)準(zhǔn)的無線鏈路收發(fā)器芯片的設(shè)計(jì)往往是他們的第三代或第四代。許多可用于下一代和自定義無線電設(shè)計(jì)以及。

　　Active-discrete （or functional-block） components are addressing next-generation radio solutions for Personal Area Networks （PANs） and wearable computers. While not as functionally dense， the flexible parts can be used to continue the trend toward higher-frequency， smaller-wavelength systems. These allow further size reductions and can use lower power levels since the PAN RF field is so limited in volumetric space.

　　Innovators anxious to lead instead of follow will be designing and building their own next-generation radio systems using presently available building blocks. This article will look at some of these active blocks. All parts， data sheets， reference designs， and development kits referenced in this article can be found online at Digi-Key’s website.