開發(fā)工具讓設(shè)計(jì)師檢查單元件的芯片為無線設(shè)計(jì)

　　你是否需要檢查出一個新的嵌入式天線、天線開關(guān)、射頻功率放大器、或更復(fù)雜的放大器，評估板和開發(fā)從組件供應(yīng)商包提供一個快速和低成本的方式來評估各種選項(xiàng)或創(chuàng)建解決方案的證據(jù)之前，一個完整的設(shè)計(jì)。選擇的范圍也可以滿足預(yù)算緊縮的要求，從而使開發(fā)成本盡可能低。通過評估板，您可以實(shí)現(xiàn)一個完整的無線系統(tǒng)信號鏈，從天線到收發(fā)器，甚至將該子系統(tǒng)鏈接到主機(jī)系統(tǒng)。

　　低成本的評估板通常是相當(dāng)小的子系統(tǒng)，通常是安裝有元件的小型電路板和電源和信號輸入和輸出的幾個連接器。一些板還包括一個小的原型區(qū)域，允許設(shè)計(jì)者定制他們的解決方案。這對于開發(fā)板上更復(fù)雜的電路尤其適用。這樣的面板傾向于提供多種選擇，使設(shè)計(jì)者在開發(fā)解決方案時具有很大的靈活性。

　　Let us look at some of the evaluation/development kit options for the wireless signal path from the antenna to the transceiver. Even simple passive devices such as embeddable antennas deserve evaluation boards to better determine how the antenna might react in the system in which it will be used. Antenova， Ethertronics， Laird， Pulse Finland， and Taoglas all offer simple development board for their antennas. TheMica 2.4 GHz SMD antenna from Antenova targets Bluetooth， Wi-Fi， and ZigBee， as well as WiMAX at 2.3 and 2.5 GHz and WiBro. A simple evaluation board with proper ground plane under the antenna lets the antenna deliver an optimum radiation pattern （Figure 1a）。 Ethertronics offers several evaluation options， the Savvi is an embedded ceramic antenna targeted at wireless LANs for 802.11a/b/g applications in the 2.4 to 2.5 and 4.9 to 5.8 GHz bands （Figure 1b， left）， while the Prestta is a standard penta-band embedded antenna for cellular systems on frequency bands of 850/9001800/1900/2100 MHz （Figure 1b， right）。 Both evaluation boards are simple designs just consisting of the antenna mounted on a ground plane and a small RF connector to connect to the rest of the system. Both antennas use the company’s isolated magnetic-dipole technology that helps keep the antenna size small and minimizes detuning regardless of the usage position.