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<div id="wee4ucu" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="skkigce" class="content" id="contentDiv" style="position:relative;"> <div id="ywwso4y" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;">分配不同的頻率，或者在設(shè)計(jì)版圖時(shí)優(yōu)化時(shí)鐘樹(Clock Tree)，以盡可能地降低動(dòng)態(tài)功耗。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">第四，降低工作的電源電壓V DD。由于功耗和電源電壓的平方項(xiàng)成正比，所以這也是降低功耗最有效的方法。但在工藝尺寸確定、一級(jí)近似條件下，電路延遲與VDD滿足下式</P><CENTER style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 12px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px" alt="鋰離子電池管理芯片的研究及其低功耗設(shè)計(jì) — 數(shù)模混合電路的低功" src="http://editerupload.eepw.com.cn/fetch/20140213/228868_2_0.jpg" width=375 height=24></CENTER><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">即有Td∝(CdVDD)/(VDD-VTH)2,其中W和L分別是器件的柵寬和柵長，μ為載流子遷移率，COX為氧化層電容，VTH為MOS管閾值電壓。</P><CENTER style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 12px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px" alt="鋰離子電池管理芯片的研究及其低功耗設(shè)計(jì) — 數(shù)模混合電路的低功" src="http://editerupload.eepw.com.cn/fetch/20140213/228868_2_1.jpg" width=500 height=221></CENTER><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">正如圖2.1.2所示，從電路能量、延遲和工作電壓的關(guān)系中可以看出，當(dāng)VDD在2.5VTH到6VTH的范圍內(nèi)，延遲和能量延遲積的變化比較平緩，在VDD=3VTH時(shí)，這兩者達(dá)到最低值。當(dāng)工作電壓繼續(xù)下降到接近VTH時(shí)，延遲將急劇上升。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">為了改善VDD下降引起的電路速度下降，可以采用并行或流水線結(jié)構(gòu)，但這將使電路面積增大;另外一種補(bǔ)償方法是，通過降低V TH來增大VDD /VTH值，但同時(shí)電路漏泄電流將增加，這時(shí)可以采用可變電壓、可變閾值電壓技術(shù)解決;在一些非關(guān)鍵電路中，也可以采用多電壓、多閾值電壓技術(shù)加以補(bǔ)償。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2.1.2數(shù)字電路的低功耗設(shè)計(jì)方法</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">在目前ASIC設(shè)計(jì)過程中，常采用的是自頂向下(Top-Down)流程。對(duì)功耗的優(yōu)化也就可以考慮到，在不同的設(shè)計(jì)層次，有目的地選擇上述影響功耗的因素，在給定的性能約束下，實(shí)現(xiàn)功耗最小化的目標(biāo)。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">從抽象層次來分，低功耗設(shè)計(jì)可以分為：系統(tǒng)級(jí)、結(jié)構(gòu)級(jí)/算法級(jí)、寄存器傳輸級(jí)、邏輯/門級(jí)和版圖級(jí)。在設(shè)計(jì)的不同層次，影響功耗的因素所起的作用各不相同，因此功耗優(yōu)化的效果也不同;綜合地看，在芯片設(shè)計(jì)時(shí)越早考慮低功耗，取得的效果也越顯著。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">1系統(tǒng)、結(jié)構(gòu)級(jí)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">在這個(gè)層次上，從系統(tǒng)功能出發(fā)，分為靜態(tài)低功耗設(shè)計(jì)和動(dòng)態(tài)功耗管理(Dynamic Power Management，DPM)技術(shù)兩種。靜態(tài)低功耗設(shè)計(jì)是在考慮系統(tǒng)的具體實(shí)現(xiàn)時(shí)，采用不同的電路結(jié)構(gòu)和不同的編碼方式，在設(shè)計(jì)階段(如綜合和編輯)實(shí)現(xiàn)低功耗;而動(dòng)態(tài)功耗管理技術(shù)是和運(yùn)行期間的行為密切相關(guān)，它需要充分考慮系統(tǒng)和任務(wù)或者和負(fù)載的關(guān)系，做出相應(yīng)的判決，來實(shí)現(xiàn)低功耗。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">1)靜態(tài)低功耗方法</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">①電路結(jié)構(gòu)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">并行(Parallelism)結(jié)構(gòu)是將一個(gè)數(shù)據(jù)處理功能模塊分為幾個(gè)相同的子模塊，并行處理數(shù)據(jù)，然后選擇對(duì)應(yīng)的輸出。這種方案允許在保持總模塊速度不變的情況下，降低各個(gè)子模塊的電壓、頻率等因素，使總功耗降低，但代價(jià)是將增加芯片的面積。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">流水線(Pipeline)結(jié)構(gòu)是在保持總體速度不變的前提下，將數(shù)據(jù)分段后連續(xù)慢速處理，速度余量則可以通過降低電壓來降低功耗。如果和并行結(jié)構(gòu)相結(jié)合，就可以取得更好的功耗節(jié)省效果。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">②電壓技術(shù)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; 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target="_blank">MSP430</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Multisim" title="Multisim" target="_blank">Multisim</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/濾波器" title="濾波器" target="_blank">濾波器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CAN總線" title="CAN總線" target="_blank">CAN總線</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/開關(guān)電源" title="開關(guān)電源" target="_blank">開關(guān)電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/單片機(jī)" title="單片機(jī)" target="_blank">單片機(jī)</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PCB" title="PCB" target="_blank">PCB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/USB" title="USB" target="_blank">USB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/ARM" title="ARM" target="_blank">ARM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CPLD" title="CPLD" target="_blank">CPLD</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/連接器" title="連接器" 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