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lesson 10 2010 common collector &amp; common base amplifiers with activities

# Lesson 10 2010 common collector & common base amplifiers with activities

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Common-Collector and Common- Base Amplifiers

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Common-Collector and Common-Base  Amplifiers Objective: after learning this section, you will be able to: Draw a common-collector (CC) amplifier; Derive the ac equivalent of a CC amplifier; Retrieve the input resistance, output resistance, and voltage gain of a CC amplifier;
Common-Collector and Common- Base Amplifiers Objective: after learning this section, you will be able to: Draw a common-base (CB) amplifier; Derive the ac equivalent of a CB amplifier; Retrieve the input resistance, output resistance, and voltage gain of a CB amplifier.

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Common-Collector Amplifier Collector at ac ground Input applied at base Output obtained at emitter (emitter- follower) Coupling capacitors dc equivalent circuit: ~ that of CE amplifier; no R C R 2 R 1 R s V s R L R E V C C
AC Equivalent Circuit R s V s R 1 R 2 R L R E

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AC Equivalent and Model R in : resistance seen by ac source A v : ratio of input voltage over output voltage R out = resistance seen by ac load R o u t R s V s V in R in R L A v .V in V o u t R 2 R s V s R 1 R in V in R o u t R L R E V o u t A v = V o u t V in
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