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Electronics-I Lecture 33

Electronics-I Lecture 33 - ofsmallsignal,largesignal...

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Lecture 33 Electronics I 1 Common-Collector Amplifier Frequent application in design  of small-signal, large-signal  amplifiers & digital circuits Commonly known as emitter  follower I/P signal applied at Base and  O/P signal obtained at Emitter r o  is included in analysis r o  is in parallel with R T-equivalent ckt. is more  convenient Unlike CE and CB amplifiers, I/ P resistance depends on R L O/P resistance depends on  R sig

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Lecture 33 Electronics I 2 Common-Collector Amplifier Resistance reflection  rule Reflecting emitter R to  base side multiply by     ( β   +1)  The ratio of i to i b Reflecting base R to  emitter side divide by      ( β  +1)  Resistance  (r o ||R L ) in  series with emitter  resistance r e
Lecture 33 Electronics I 3 Common-Collector Amplifier Input Resistance at base  R ib =( β  +1) [r e + (r o ||R L )] v o =v b (r o ||R L )/[r e + (r o ||R L )] Voltage Gain A V  = v o / v

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