TDM1.2-05-300電源和地線噪聲的抑制 在車(chē)用CD,VCD中大量地應(yīng)用CMOS數(shù)字器件和數(shù)字模擬混合器件,當(dāng)設(shè)備工作時(shí)這些器件同時(shí)工作會(huì)使電路板內(nèi)的電源電壓和地電平波動(dòng),導(dǎo)致信號(hào)波形產(chǎn)生尖峰過(guò)沖或衰減振蕩,造成數(shù)字IC電路的噪聲容限下降而引起誤動(dòng)作。其原因是數(shù)字IC的開(kāi)關(guān)電流在電源線、地線上形成的電壓降與印制條和元器件引腳的分布電感所形成的感應(yīng)電壓降,兩者起作用的結(jié)果。由于車(chē)用VCD中有多條高頻數(shù)字信號(hào)線,因此,電源和地線的干擾相當(dāng)嚴(yán)重。其次,由于一部分CMOS電路是數(shù)字模擬混合器件,如D/A轉(zhuǎn)換器件,根據(jù)CMOS的基本理論,數(shù)字和模擬電路形成在同一個(gè)類(lèi)型芯片上,如只有數(shù)字部分電源VDD供電,盡管模擬電源未接,VDD的TDM1.2-05-300電能會(huì)轉(zhuǎn)換到模擬部分上去,VDD電壓依然會(huì)出現(xiàn)于模擬電源VOC腳上。同樣,VDD上存在的噪聲亦會(huì)出現(xiàn)在VOC上,由于VDD和VOC上的噪聲作用造成數(shù)?;旌想娐?,如音頻D/A PCM1710的THD+N和動(dòng)態(tài)范圍下降,影響整機(jī)的性能。 為抑制電源和地線噪聲,筆者認(rèn)為在車(chē)用VCD設(shè)計(jì)中可采取以下措施:(1)、選用貼片元件和盡可能縮短元件的引腳長(zhǎng)度,以減小元件分布電感的影響;選用噪聲容限大的數(shù)字IC。(2)、在VDD及VOC電源端盡可能靠近器件接入濾波電容,以縮短開(kāi)關(guān)電流的流通途徑,用10μF鋁電解和0.1μF獨(dú)石電容并聯(lián)接在電源腳上。對(duì)于MPEG板主電源輸入端和MPEG解碼芯片以及DRAM,SDRAM等高速數(shù)字IC的電源端可用鉭電解電容代替鋁電解電容,因?yàn)楦哳l時(shí)鉭電解的對(duì)地阻抗比鋁電解小得多。(3)、印制板布局時(shí),要將模擬電路區(qū)和數(shù)字電路區(qū)合理地分開(kāi),電源和地線單獨(dú)引出,電源供給處匯集到一點(diǎn);PCB布線時(shí),高頻數(shù)字信號(hào)線要用短線,主要信號(hào)線最好集中在PCB板中心,時(shí)鐘發(fā)生電路應(yīng)在板中心附近,時(shí)鐘扇出應(yīng)采用菊鏈?zhǔn)交虿⒙?lián)布線,電源線盡可能遠(yuǎn)離高頻數(shù)字信號(hào)線或用地線隔開(kāi)。(4)、印制板的電源線和地線印制條盡可能寬,以減小線電阻,從而減小公共阻抗引起的干擾噪聲。(5)、TDM1.2-05-300對(duì)數(shù)模混合電路,VDD與VOC應(yīng)連到模擬電TDM1.2-05-300源VOC,AGND與DGND接到模擬地AGND。根據(jù)BB,PHILIPS,ALPINE公司實(shí)驗(yàn)結(jié)果,建議把D/A器件視為模擬器件,MPEG電路與D/A器件連接中,D/A器件必須置于AGND上,同時(shí)要提供一條數(shù)字回路供這些數(shù)字噪聲/能量反饋回信號(hào)源,以減小數(shù)字器件的噪聲對(duì)模擬電路的影響
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TDM1.2-05-300
TDM1.2-050-300-W
TDM1.2-100-300
TDM1.2ES
TDM3.2-020-300-W
TDM3.2-020-300W0
TDM3.2-20-300-WO
TDM4.1-020-300-W0/S102
TDM1.2-50-300W1
TDM1.2-30-300W0
TDM1.2-100-300W1
TDM2.1-015-300
TDM2.1-030-300
TDM3.2-020-300
TDM3.2-030-300
TDM4.1-020-300
TDM4.1-030-300
TDM6.1-015-300
TDM6.1-030-300
TDM7.1-015-300
TDM7.1-030-300
TDM1.2-030-300
TDM1.2-050-300
TDM1.2-100-300
TDM1.2-030-300-W0
TDM1.2-050-300-W1
TDM1.2-100-300-W1
TDM1.2-030-300-W1
TDM2.1-030-300-W1
TDM2.1-030-300-W0
TDM2.1-015-300-W0
TDM3.2-030-300-W1
TDM4.1-020-300-W0
TDM4.1-030-300-W1
TDM6.1-015-300-W0
TDM6.1-030-300-W1
TDM7.1-015-300-W0
TDM7.1-030-300-W1
TDM4.1-020-300-W0/S102
TDM1.2-100-300-W1-115
TDM1.2-030-300-W1-000/S105
TDM1.2-050-300-W1-000/S105
TDM1.2-100-300-W1-000/S105
TDM1.2-030-300-W1-220/S100
TDM1.2-100-300-W1-220/S100
TDM2.1-030-300-W1-220/S101
TDM1.2-050-300-W1-220/S102
TDM4.1-030-300-W1/S102
TDM1.2-100-300-W1-000/S102
TDM1.2-050-300-W1-000/S102
TDM1.2-030-300-W1-000/S102
TDM1.2-100-300-W1-000/S100
TDM3.3-030-300-W1
TDM1.3-030-300-W1-000
TDM1.3-050-300-W1-000
TDM1.3-100-300-W1-000
TDM7.1-015-300-W0/S102
TDM4.3-020-300-W0
TDM4.3-030-300-W1
TDM1.2-050-300-W1-000/S107
TDM1.3-030-300-W1-000/S102
TDM1.3-100-300-W1-000/S102
TDM1.3-100-300-W1-000/S100
TDM1.3-030-300-W1-000/S105
TDM1.3-050-300-W1-000/S105
TDM1.3-100-300-W1-000/S105
TDM7.1-030-300-W1/S102
TDM1.4-050-300-W1-000
TDM1.4-100-300-W1-000
TDM1.2-050-300-W1-000/S100
TDM1.2-030-300-W1-000/S107
TDM1.2-050-300-W1-000/S108
TFM3.1-050-300-W1-220
TFM3.1-050-300-W1-220
TFM3.1-050-300-W1-1
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