模拟设计的100条经验

模拟设计的100条经验1/Capacitorsandresistorshaveparasiticinductance,about0.4nHforsurfacemountand4nHforaleadedcomponent.2/Ifyoudon"twantahighbandwidthtransistortooscillateplacelossycomponentsinatleast2ofthe3leads.Ferritebeadsworkwell.3/WhentakingDCmeasurementsinacircuitandtheydon"tmakesense,suspectthatsomethingisoscillating.4/Opampswilloftenoscillatewhendrivingcapacitiveloads.5/Thebase-emittervoltageVbeofasmallsignaltransistorisabout0.65vanddropsabout2mV/degC.Vbegoesdownwithincreasingtemp.6/Multiply0.13nVbythesquarerootoftheohmicvalueofaresistortofindthenoiseina1Hzbandwidth.ThenmultiplybythesquarerootoftheBWinHzgivesthetotalnoisevoltage.7/Johnsonnoisecurrentgoesdownwitha