Transcription of Transimpedance Considerations for High-Speed …
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Transimpedance Considerations for High-Speed …
ApplicationReportSBOA122 ,gain, ,providesa setofdetaileddesignequations,explainstho seequations, (10pFSourceCapacitance).. November2009 TransimpedanceConsiderationsforHigh-Spee dAmplifiersSubmitDocumentationFeedbackCo pyright 2009,TexasInstrumentsIncorporated-VBlA(s )VOCFCCMCDCDIFFRFIDV-C = C + C+ CSDCMDIFFV = V A(s)O--A(s) =As +wwOLAA VIOD=-ZF1 +1 +ZZFGA(s) transimpedancecircuitis toconvertaninputcurrentfroma currentsource(typicallyaphotodiode) tousea ,theachievablegainusingthismethodis ; ; closed-loopapproach,usinganoperationalam plifier,is typicalcircuitwithallnecessarycomponents forthisanalysisis shownin Figure1. Inthiscircuit,thegeneratoris a photodiode,whoseroleis toconvertthephotonsintoa thenamplifiedbythefeedbackresistorRF.
GBP = 2 F R Cp · ·- 3dB F S 2 300 250 200 150 100 50 0 Maximum Achievable requency Response (MHz) 1 2 5 10 20 50 100 200 500 1000 Maximum Transimpedance Gain (k ) W
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