Not only regulator can transform a constant voltage to some kinds of various voltages , but also the transformed voltages must be not changeable with temperature changing ( i . e . zero temperature coefficient ) . and it should be stable though the power supply is not immune . so the art of regulator design should be more challenging 電壓調(diào)節(jié)器不僅要具有將某個(gè)固定電壓轉(zhuǎn)換成所需要數(shù)值的電壓的功能,而且轉(zhuǎn)換后的電壓須具有在一定的溫度范圍內(nèi)不隨溫度的變化而變化(也即零溫度系數(shù)) ,以及不受輸入電壓噪聲影響的特點(diǎn),這對(duì)電壓調(diào)節(jié)器的設(shè)計(jì)提出了更高的要求。
The development of filters , resonators and other telecommunication technology required better dielectric materials . the dielectric materials , used as the resonate body , should be high in dielectric constant , low in dielectric loss and a near zero temperature coefficient of dielectric constant in high frequency band , also could be sintered in a relative low temperature so as to reduce production cost , and what ’ s more , the miniaturization and reliability of materials are also the main aspects in the research work of high frequency band dielectric materials 隨著濾波器、諧振器等器件以及通信技術(shù)的發(fā)展,人們對(duì)電介質(zhì)材料的要求越來(lái)越高,要求作為介質(zhì)諧振腔的電介質(zhì)材料在高頻段下具有高介電常數(shù),低介電損耗,接近于零的介電常數(shù)溫度系數(shù),還要求高頻電介質(zhì)材料能夠在較低的燒結(jié)溫度下燒成,以降低實(shí)際生產(chǎn)的成本,此外,材料的小型化,高可靠性也是高技術(shù)高頻介質(zhì)材料的重要研究方向。