标签: bode

如何用Bode图判断系统的稳定性

Abstract:Transimpedanceamplifiers(TIAs)arewidelyusedtotranslatethecurrentoutputofsensorslikephotodiode-to-voltagesignals,sincemanycircuitsandinstrumentscanonlyacceptvoltageinput.AnoperationalamplifierwithafeedbackresistorfromoutputtotheinvertinginputisthemoststraightforwardimplementationofsuchaTIA.However,eventhissimpleTIAcircuitrequirescarefultrade-offsamongnoisegain,offsetvoltage,bandwidth,andstability.ClearlystabilityinaTIAisessentialforgood,reliableperformance.Thisapplicationnoteexplainstheempiricalcalculationsforassessingstabilityandthenshowshowtofine-tunetheselectionofthefeedbackphase-compensationcapacitor.Maxim>DesignSupport>TechnicalDocuments>Tutorials>AmplifierandComparatorCircuits>APP5129Maxim>DesignSupport>TechnicalDocuments>Tutorials>Sensors>APP5129Keywords:TIA,transimpedanceamplifier,transimpedanceamp,photodiode,medicalinstrumentation,industrialcontrol,piezo-sensorinterface,TIAstability,feedbackcapacitance,phasecompensation,bodeplotFeb03,2012TUTORIAL5129StabilizeYourTransimpedanceAmplifierBy:AkshayBhat,SeniorStrategicApplicationsEngineerFeb03,2012Abstract:Transimpedanceamplifiers(TIAs)arewidelyusedtotranslatethecurrentoutputofsensorslikephotodiode-to-voltagesignals,sincema……

摘要：互阻放大器（TIA）被广泛用于转换电流输出的传感器，如光电二极管的电压信号，因为许多电路和仪器只能接受电压输入。与一个反馈电阻从输出到反相输入的运算放大器是最简单的实现这样一个TIA。然而，即使这样简单的TIA电路之间的噪声增益，失调电压，带宽和稳定性需要仔细权衡。显然，在TIA的稳定是必不可少的好，性能可靠。本应用笔记介绍了评估稳定的经验计算，然后显示如何微调反馈相位补偿电容的选择。Maxim>DesignSupport>TechnicalDocuments>Tutorials>AmplifierandComparatorCircuits>APP5129Maxim>DesignSupport>TechnicalDocuments>Tutorials>Sensors>APP5129Keywords:TIA,transimpedanceamplifier,transimpedanceamp,photodiode,medicalinstrumentation,industrialcontrol,piezo-sensorinterface,TIAstability,feedbackcapacitance,phasecompensation,bodeplotFeb03,2012TUTORIAL5129StabilizeYourTransimpedanceAmplifierBy:AkshayBhat,SeniorStrategicApplicationsEngineerFeb03,2012Abstract:Transimpedanceamplifiers(TIAs)arewidelyusedtotranslatethecurrentoutputofsensorslikephotodiode-to-voltagesignals,sincema……

摘要：低输入电容运算放大器的应用，如烟雾探测器，光电二极管放大器，医疗仪器，工业控制系统，压电式传感器接口。最大限度地降低输入电容也可以增加一杆在反馈路径的频率，直到它有一个电路的影响可以忽略。测量运算放大器的输入电容是不平凡的，尤其是如果该值是只有几个皮法。如此低的价值也提出在生产过程中测试的筛选运算放大器的困难。这一设计思想，介绍了如何准确地确定任何运算放大器的输入电容。Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP5086Keywords:opamp,operationalamp,inputcapacitance,transimpedanceamp,photodiodetransimpedanceamp,medicalinstrumentation,industrialcontrol,piezo-sensorinterface,bodeplot,RCfilter,opampinputimpedance,opampstability,photodiodecapacitanceJul01,2011APPLICATIONNOTE5086MeasuretheInputCapacitanceofanOpAmpBy:AkshayBhat,SeniorStrategicApplicationsEngineerAbstract:Opampswithlowinputcapacitancearerequiredinapplicationssuchassmokedetectors,photodiodetransimpedanceamplifiers,medicalinstrumentation,industrialcontrolsystems,andth……