小Low成本，低功耗的一次性收音機(jī)1部分：發(fā)射機(jī)

　　減少尺寸，重量，功率和射頻（RF）組件的成本變得越來越重要，在滿足行業(yè)要求。特別是，遙測，數(shù)據(jù)采集，環(huán)境傳感器，野生動(dòng)物傳感器，和其他遠(yuǎn)程或無人應(yīng)用程序需要小，低功耗和低成本的傳輸只使用一次設(shè)計(jì)的無線電數(shù)據(jù)，在一開始就一次性或短期使用。更重要的是，這些短暫的系統(tǒng)通常放在最惡劣的環(huán)境受到熱、冷、沖擊、振動(dòng)、甚至ESD，EMI，RFI，和太陽耀斑。

　　設(shè)計(jì)這些鏈接需要不同的機(jī)智比典型的產(chǎn)品，有一個(gè)相當(dāng)良好的工程生命周期?？煽啃?，巧妙的低功耗技術(shù)和小型化往往是必不可少的元素。在某些應(yīng)用中，成百上千的這些專用鏈接將被使用和部署，因此成本也是一個(gè)驅(qū)動(dòng)因素。

　　This article looks at issues related to disposable-transmitter-radio designs. Choices of protocols， modulation， transmit-power levels， and operation are examined， as are some of the parts and techniques useful for these types of designs. In Part 1 of this 3-part series we will look at low-cost AM and OOK technologies that are relatively simple yet still provide reliable operation using low-power， narrow bands for one-way， transmit-only functionality. In Part 2 we will then examine corresponding FM and PSK narrow-band solutions and parts. Lastly， in Part 3 we will examine single-chip radio transceivers that embed a microcontroller alongside the radio to achieve higher levels of performance. All parts， data sheets， tutorials， development kits， and training referenced here can be found on the Digi-Key website.