電子與通信技術(shù)專業(yè)英語Unit-Ⅱ-7課件

UnitⅡElectronicCircuitandItsApplicationLesson7FiltersUnitⅡElectronicCircuitNewWordsfilter[filt?]n.濾波器modify['m?difai]vt.更改,修改eliminate[i‘limineit]vt.排除,消除,除去regulation[,reɡju'lei??n]n.規(guī)則,調(diào)節(jié),校準(zhǔn)crystal['krist?l]n.水晶,結(jié)晶,晶體NewWordsceramic[si'r?mik]a.&n.陶器的,陶瓷categorize[‘k?tiɡ?raiz]v.加以類別,分類bandpass['b?ndpɑ:s]

n.帶通highpassn.高通lowpassn.低通ceramic[si'r?mik]a.&n.PhrasesandExpressions

passivefilter

無源濾波器activefilter

有源濾波器PhrasesandExpressions

Notes1.Afilterisapassiveoractivecircuitdesignedprimarilyforthepurposeofmodifyingasignalorsourceofpower.

濾波器包括無源濾波器和有源濾波器，它們主要是為了改變信號或電源輸出而設(shè)計的。句中designed…orsourceofpower是過去分詞短語，充當(dāng)定語，修飾circuit。Notes2.Inpowersupply,thefilterisnetworkofcapacitors,resistorandinductsthateliminatestherectifier.

在電源中，濾波器由電容、電阻、與電感組網(wǎng)而成，從而代替了整流器。

⑴isnetworkof相當(dāng)于consistof，意思是“由……組成”；⑵定語從句thateliminatestherectifier修飾thefilter。2.Inpowersupply,thefilter3.Filterareusedincommunicationspracticetoeliminateenergyatsomefrequencieswhileallowingenergyatotherfrequenciestopasswithlittleornoattenuation.

在通信系統(tǒng)中，濾波器主要用來濾除某些頻率成分而允許另一些頻率成分無衰減地通過。

⑴不定式toeliminateenergyatsomefrequencies充當(dāng)主語補(bǔ)足語；

⑵while后接現(xiàn)在分詞短語，表示輕微轉(zhuǎn)折。3.Filterareusedincommunica4.Suchfilters,ifpassive,areconstructedusingcapacitors,inductorandsometimesresistors.

句中ifpassive省略了主謂部分，即theyare。4.Suchfilters,ifpassive,ar5.Activefiltersgenerallyutilizeoperationalamplifiers.

句中utilize意為“利用”，相當(dāng)于use。5.Activefiltersgenerallyuti6.Filterscanbecategorized,intermsoftheirfrequencyresponsecharacteristics,intofourgroups.⑴tocategorizeinto…相當(dāng)于toclassifyinto…或groupinto…，“把……分成”；

⑵intermsof相當(dāng)于accordingto。6.Filterscanbecategorized,7.Thehighpassfilterallowsonlythesignalsaboveacertainfrequenciestopass.

高通濾波器只允許高于某個頻率的信號通過。句中certain表示某種模糊概念，“某種，某個”。7.Thehighpassfilterallowso8.Somearedesignedtouseatradiofrequencies,whileothersoperateataudiofrequencies.

有的用于射頻，有的用于音頻。

whileothersoperateataudiofrequencies中省略了aredesignedto，其中while表示輕微轉(zhuǎn)折。8.SomearedesignedtouseatTranslationofTextsLesson7FiltersAfilterisapassiveoractivecircuitdesignedprimarilyforthepurposeofmodifyingasignalorsourceofpower.Apassivefilterrequiresnopowerforitsoperation,andalwayshasacertainamountofloss.Anactivefilterrequiresitsownpower,butmayprovidegain.TranslationofTextsLesson7第7課濾波器濾波器包括無源濾波器和有源濾波器，它們主要是為了改變信號而設(shè)計的。無源濾波器不需要電源就可以工作且會有一定的損耗。有源濾波器則需要電源且能提供功率增益。第7課濾波器Inpowersupply,thefilterisnetworkofcapacitors,resistorandinductsthateliminatestherectifier.Agoodpowersupplyfilterwillproduceasmoothdirectcurrentoutputundervariableloadconditions,withgoodregulation.Inpowersupply,the

在電源中，濾波器由電容、晶體管和電感組成，用以消除來自于整流器的直流電流的波動。好的電源濾波器能夠在負(fù)載可變及好的穩(wěn)壓條件下獲得平滑的直流輸出電流。在電源中，濾波器由電容、晶體管和電感組成Filterareusedincommunicationspracticetoeliminateenergyatsomefrequencieswhileallowingenergyatotherfrequenciestopasswithlittleornoattenuation.Suchfilters,ifpassive,areconstructedusingcapacitors,inductorandsometimesresistors.Activefiltersgenerallyutilizeoperationalamplifiers(asshowninFig.7-1).Filterareusedinco

在通信系統(tǒng)中，濾波器主要用來濾除某些頻率成分而允許另一些頻率成分無衰減地通過。如果是無源濾波器，則由電容、電感、晶體管構(gòu)成；有源濾波器，則由運算放大器構(gòu)成（如圖7-1所示）。在通信系統(tǒng)中，濾波器主要用來濾除某些頻率Amplifiersincludedinafilterdesigncanbeusedtoimprovetheperformanceofafilter,whileavoidingtheneedforinductors(whicharetypicallyexpensivecomparedtoothercomponents).Anamplifieralsocanpreventtheloadimpedanceofthefollowingstagefromaffectingthecharacteristicsofthefilter.Anactivefiltercanhavecomplexpolesandzeroswithoutusingabulkyorexpensiveinductor.Theshapeoftheresponse,theQ(qualityfactor),andthetunedfrequencycanoftenbesetwithinexpensivevariableresistors.Amplifiersincluded

在濾波器設(shè)計中，放大器可以用來提高濾波器的性能，同時避免了必須使用電感器（這相對于其他組成部分而言通常是昂貴的）。放大器還可以防止下一級負(fù)載阻抗對濾波器特性的影響。有源濾波器即使不使用笨重的或昂貴的電感器也可以通過調(diào)節(jié)廉價的可變電阻器來設(shè)置。在濾波器設(shè)計中，放大器可以用來提高濾波器Mechanicalfiltersmakeuseoftheresonantpropertiesofcertainsubstances.Crystalandceramicfiltersusepiezoelectricmaterialstoobtainthedesiredfrequencyresponse.Mechanicalfiltersma

機(jī)械濾波器由某些具有諧振特性的材料制成，晶體濾波器和陶瓷濾波器采用具有壓電特性的材料以獲得理想的頻率響應(yīng)。機(jī)械濾波器由某些具有諧振特性的材料制成，F(xiàn)ilterscanbecategorized,intermsoftheirfrequencyresponsecharacteristics,intofourgroups.Thebandpassfilterallowssignalbetweentwopredeterminedfrequenciestopass,butattenuatesallotherfrequencies.Theband-rejectionorbandstopfiltereliminatesallenergybetweentwofrequencies,andallowssignalsoutsidethelimitfrequenciestopass.Filterscanbecatego

濾波器根據(jù)其頻率響應(yīng)特性可分為4種類型。帶通濾波器允許兩個預(yù)定頻率之間的信號通過而衰減其他頻率的信號。帶阻濾波器禁止兩個頻率之間的信號通過而允許兩個頻率之外的所有信號通過。濾波器根據(jù)其頻率響應(yīng)特性可分為4種類型。Thehighpassfilterallowsonlythesignalsaboveacertainfrequenciestopass.Thelowpassfilerallowsonlythesignalsbelowacertainfrequencytopass.Theactualresponsecharacteristicsofallfourtypesoffilterarehighlyvariable,anddependonmanydifferentfactors.Selectivefilersareemployedinbothtransmittingandreceivingapplications.Somearedesignedforuseatradiofrequencies,whileothersoperateataudiofrequencies.

Thehighpassfiltera

高通濾波器只允許高于某個頻率的信號通過，低通濾波器只允許低于某個頻率的信號通過。4種濾波器的實際頻率特性都是依賴許多不同的因素而變化的。濾波器廣泛地用于發(fā)射機(jī)和接收機(jī)，有的用于射頻，有的用于音頻。高通濾波器只允許高于某個頻率的信號通過，Exercises1.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.Exercisesa.Apassivefilterrequirespowerforitsoperation,andalwayshasacertainamountofloss.b.Anactivefilterrequiresitsownpower,butmayprovidegain.a.Apassivefilterrequirespoc.Inpowersupply,thefilterisnetworkofcapacitors,resistorandinducts.d.Agoodpowersupplyfilterwillproduceasmoothdirectcurrentoutputundervariableloadconditions,withgoodregulation.c.Inpowersupply,thefiltere.Filterisusedincommunicationspracticetoeliminateenergyatsomefrequencieswhileallowingenergyatotherfrequenciestopasswithlittleornoattenuation.f.Suchfilters,ifpassive,areconstructedusingresistors,inductorandsometimescapacitors.e.Filterisusedincommunicatg.Theband-rejectionorbandstopfiltereliminatesallenergybetweentwofrequencies,andallowssignalsoutsidethelimitfrequenciestopass.h.Selectivefilersareemployedinbothtransmittingandreceivingapplications.g.Theband-rejectionorbandst2.Matchthefollowingtermstoappropriatedefinitionorexpression.2.Matchthefollowingtermstoa.afilter1.allowssignalbetweentwopredeterminedfrequenciestopassb.thehighpassfilter2.allowsthesignalsbelowacertainfrequencytopassc.thelowpassfiler3.eliminatesallenergybetweentwofrequenciesd.thebandpassfilter4.allowsthesignalsaboveacertainfrequenciestopasse.theband-rejectionfilter5.apassiveoractivecircuitdesignedprimarilyforthepurposeofmodifyingasignalorsourceofpower.a.afilter3.Fillinthemissingwordsaccordingtothetext.3.Fillinthemissingwordsaca.Afilterisa

or

circuitdesignedprimarilyforthepurposeofmodifyingasignalorsourceofpower.a.Afilterisaorb.Inpowersupply,thefilterisnetworkof

,

and

thateliminatestherectifier.Agoodpowersupplyfilterwillproduceasmoothdirectcurrentoutputundervariableloadconditions,withgoodregulation.b.Inpowersupply,thefilterc.Suchfilters,ifpassive,areconstructedusing

,

andsometimes

.

c.Suchfilters,ifpassive,ard.Somearedesignedforuseat

frequencies,whileothersoperateat

frequencies.

d.Somearedesignedforuse4.

TranslatethefollowingsentencesintoEnglish.4.Translatethefollowingsen⑴無源濾波器由電阻、電容、電感組成。⑴無源濾波器由電阻、電容、電感組成。⑵有源濾波器由集成運放組成。⑵有源濾波器由集成運放組成。⑶濾波器按其頻率特性可分為高通濾波器、低通濾波器、帶通濾波器和帶阻濾波器。⑶濾波器按其頻率特性可分為高通濾波器、低通濾波器、帶通濾波器⑷濾波器主要用來濾除某些頻率成分而允許另一些頻率成分無衰減地通過。⑷濾波器主要用來濾除某些頻率成分而允許另一些頻率成分無衰減地⑸濾波器可用于射頻也可用于音頻。⑸濾波器可用于射頻也可用于音頻。EndEndUnitⅡElectronicCircuitandItsApplicationLesson7FiltersUnitⅡElectronicCircuitNewWordsfilter[filt?]n.濾波器modify['m?difai]vt.更改,修改eliminate[i‘limineit]vt.排除,消除,除去regulation[,reɡju'lei??n]n.規(guī)則,調(diào)節(jié),校準(zhǔn)crystal['krist?l]n.水晶,結(jié)晶,晶體NewWordsceramic[si'r?mik]a.&n.陶器的,陶瓷categorize[‘k?tiɡ?raiz]v.加以類別,分類bandpass['b?ndpɑ:s]

n.帶通highpassn.高通lowpassn.低通ceramic[si'r?mik]a.&n.PhrasesandExpressions

passivefilter

無源濾波器activefilter

有源濾波器PhrasesandExpressions

Notes1.Afilterisapassiveoractivecircuitdesignedprimarilyforthepurposeofmodifyingasignalorsourceofpower.

濾波器包括無源濾波器和有源濾波器，它們主要是為了改變信號或電源輸出而設(shè)計的。句中designed…orsourceofpower是過去分詞短語，充當(dāng)定語，修飾circuit。Notes2.Inpowersupply,thefilterisnetworkofcapacitors,resistorandinductsthateliminatestherectifier.

在電源中，濾波器由電容、電阻、與電感組網(wǎng)而成，從而代替了整流器。

⑴isnetworkof相當(dāng)于consistof，意思是“由……組成”；⑵定語從句thateliminatestherectifier修飾thefilter。2.Inpowersupply,thefilter3.Filterareusedincommunicationspracticetoeliminateenergyatsomefrequencieswhileallowingenergyatotherfrequenciestopasswithlittleornoattenuation.

在通信系統(tǒng)中，濾波器主要用來濾除某些頻率成分而允許另一些頻率成分無衰減地通過。

⑴不定式toeliminateenergyatsomefrequencies充當(dāng)主語補(bǔ)足語；

⑵while后接現(xiàn)在分詞短語，表示輕微轉(zhuǎn)折。3.Filterareusedincommunica4.Suchfilters,ifpassive,areconstructedusingcapacitors,inductorandsometimesresistors.

句中ifpassive省略了主謂部分，即theyare。4.Suchfilters,ifpassive,ar5.Activefiltersgenerallyutilizeoperationalamplifiers.

句中utilize意為“利用”，相當(dāng)于use。5.Activefiltersgenerallyuti6.Filterscanbecategorized,intermsoftheirfrequencyresponsecharacteristics,intofourgroups.⑴tocategorizeinto…相當(dāng)于toclassifyinto…或groupinto…，“把……分成”；

⑵intermsof相當(dāng)于accordingto。6.Filterscanbecategorized,7.Thehighpassfilterallowsonlythesignalsaboveacertainfrequenciestopass.

高通濾波器只允許高于某個頻率的信號通過。句中certain表示某種模糊概念，“某種，某個”。7.Thehighpassfilterallowso8.Somearedesignedtouseatradiofrequencies,whileothersoperateataudiofrequencies.

有的用于射頻，有的用于音頻。

whileothersoperateataudiofrequencies中省略了aredesignedto，其中while表示輕微轉(zhuǎn)折。8.SomearedesignedtouseatTranslationofTextsLesson7FiltersAfilterisapassiveoractivecircuitdesignedprimarilyforthepurposeofmodifyingasignalorsourceofpower.Apassivefilterrequiresnopowerforitsoperation,andalwayshasacertainamountofloss.Anactivefilterrequiresitsownpower,butmayprovidegain.TranslationofTextsLesson7第7課濾波器濾波器包括無源濾波器和有源濾波器，它們主要是為了改變信號而設(shè)計的。無源濾波器不需要電源就可以工作且會有一定的損耗。有源濾波器則需要電源且能提供功率增益。第7課濾波器Inpowersupply,thefilterisnetworkofcapacitors,resistorandinductsthateliminatestherectifier.Agoodpowersupplyfilterwillproduceasmoothdirectcurrentoutputundervariableloadconditions,withgoodregulation.Inpowersupply,the

在電源中，濾波器由電容、晶體管和電感組成，用以消除來自于整流器的直流電流的波動。好的電源濾波器能夠在負(fù)載可變及好的穩(wěn)壓條件下獲得平滑的直流輸出電流。在電源中，濾波器由電容、晶體管和電感組成Filterareusedincommunicationspracticetoeliminateenergyatsomefrequencieswhileallowingenergyatotherfrequenciestopasswithlittleornoattenuation.Suchfilters,ifpassive,areconstructedusingcapacitors,inductorandsometimesresistors.Activefiltersgenerallyutilizeoperationalamplifiers(asshowninFig.7-1).Filterareusedinco

在通信系統(tǒng)中，濾波器主要用來濾除某些頻率成分而允許另一些頻率成分無衰減地通過。如果是無源濾波器，則由電容、電感、晶體管構(gòu)成；有源濾波器，則由運算放大器構(gòu)成（如圖7-1所示）。在通信系統(tǒng)中，濾波器主要用來濾除某些頻率Amplifiersincludedinafilterdesigncanbeusedtoimprovetheperformanceofafilter,whileavoidingtheneedforinductors(whicharetypicallyexpensivecomparedtoothercomponents).Anamplifieralsocanpreventtheloadimpedanceofthefollowingstagefromaffectingthecharacteristicsofthefilter.Anactivefiltercanhavecomplexpolesandzeroswithoutusingabulkyorexpensiveinductor.Theshapeoftheresponse,theQ(qualityfactor),andthetunedfrequencycanoftenbesetwithinexpensivevariableresistors.Amplifiersincluded

在濾波器設(shè)計中，放大器可以用來提高濾波器的性能，同時避免了必須使用電感器（這相對于其他組成部分而言通常是昂貴的）。放大器還可以防止下一級負(fù)載阻抗對濾波器特性的影響。有源濾波器即使不使用笨重的或昂貴的電感器也可以通過調(diào)節(jié)廉價的可變電阻器來設(shè)置。在濾波器設(shè)計中，放大器可以用來提高濾波器Mechanicalfiltersmakeuseoftheresonantpropertiesofcertainsubstances.Crystalandceramicfiltersusepiezoelectricmaterialstoobtainthedesiredfrequencyresponse.Mechanicalfiltersma

機(jī)械濾波器由某些具有諧振特性的材料制成，晶體濾波器和陶瓷濾波器采用具有壓電特性的材料以獲得理想的頻率響應(yīng)。機(jī)械濾波器由某些具有諧振特性的材料制成，F(xiàn)ilterscanbecategorized,intermsoftheirfrequencyresponsecharacteristics,intofourgroups.Thebandpassfilterallowssignalbetweentwopredeterminedfrequenciestopass,butattenuatesallotherfrequencies.Theband-rejectionorbandstopfiltereliminatesallenergybetweentwofrequencies,andallowssignalsoutsidethelimitfrequenciestopass.Filterscanbecatego

濾波器根據(jù)其頻率響應(yīng)特性可分為4種類型。帶通濾波器允許兩個預(yù)定頻率之間的信號通過而衰減其他頻率的信號。帶阻濾波器禁止兩個頻率之間的信號通過而允許兩個頻率之外的所有信號通過。濾波器根據(jù)其頻率響應(yīng)特性可分為4種類型。Thehighpassfilterallowsonlythesignalsaboveacertainfrequenciestopass.Thelowpassfilerallowsonlythesignalsbelowacertainfrequencytopass.Theactualresponsecharacteristicsofallfourtypesoffilterarehighlyvariable,anddependonmanydifferentfactors.Selectivefilersareemployedinbothtransmittingandreceivingapplications.Somearedesignedforuseatradiofrequencies,whileothersoperateataudiofrequencies.

Thehighpassfiltera

高通濾波器只允許高于某個頻率的信號通過，低通濾波器只允許低于某個頻率的信號通過。4種濾波器的實際頻率特性都是依賴許多不同的因素而變化的。濾波器廣泛地用于發(fā)射機(jī)和接收機(jī)，有的用于射頻，有的用于音頻。高通濾波器只允許高于某個頻率的信號通過，Exercises1.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.Exercisesa.Apassivefilterrequirespowerforitsoperation,andalwayshasacertainamountofloss.b.Anactivefilterrequiresitsownpower,butmayprovidegain.a.Apassivefilterrequirespoc.Inpowersupply,thefilterisnetworkofcapacitors,resistorandinducts.d.Agoodpowersupplyfilterwillproduceasmoothdirectcurrentoutputundervariableloadconditions,withgoodregulation.c.Inpowersupply,thefiltere.Filterisusedincommunicationspracticetoeliminateenergyatsomefrequencieswhileallowingenergyatotherfrequenciestopasswithlittleornoattenuation.f.Suchfilters,ifpassive,areconstructedusingresistors,inductorandsometimescapacitors.e.Filterisusedincommunicatg.Theband-rejectionorbandstopfiltereliminatesallenergybetweentwofrequencies,andallowssignalsoutsidethelimitfrequenciestopass.h.Selectivefilersareemployedinbothtransmittingandreceivingapplications.g.Theband-rejectionorbandst2.Matchthefollowingtermstoappropriatedefinitionorexpression.2.Matchthefollowingtermstoa.afilter1.allowssignalbetweentwopredeterminedfrequenciest