CAPACITIVE_LOAD_EMITTER_FOLLOWER

Published:2009/6/24 23:29:00 Author:May | From:SeekIC

Overcomes problem that develops with trailing edges of pulses when emitter-follower using NPN transistor is driving heavily capacitive load. Extra transistor is used to dump capacitor charge when emitter-follower stops conducting at trailing edge of input waveform. Pulse trailing edge thus tends to cut off a, and saturate lower transistor so it discharges capacitor. Circuit works equally well with pulses, square waves,and sine waves Transistors need not bematched Reverse polarity of supplies to usePNP transistors Useful for driving long coaxlines or logic from high-impedance source,without inversion，－H.L.Morgan,Emitter Follower's Fall Time Is Independent of Load、EDN Magazine Feb，5,1977,p 105



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