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Q&A Purpose of emitter resistor in a common collector amplifier

I see a lot of common collector amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I sh...

4 answers  ·  posted 4y ago by jm567‭  ·  edited 1y ago by Lorenzo Donati‭

#4: Post edited by user avatar Lorenzo Donati‭ · 2023-08-09T18:48:39Z (about 1 year ago)
Reformatted for better readability. Retagged.
  • I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I should mention that I am referring to an emitter follower biased by the collector output of a previous common emitter stage.
  • I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor.
  • What is the purpose of doing it this way instead of connecting your load directly to the emitter?
  • I should mention that I am referring to an emitter follower biased by the collector output of a previous common emitter stage.
#3: Post edited by user avatar Olin Lathrop‭ · 2020-10-05T12:46:25Z (about 4 years ago)
Removed pointless fluff.
  • Hello,
  • I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I should mention that I am referring to an emitter follower biased by the collector output of a previous common emitter stage. Thanks.
  • I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I should mention that I am referring to an emitter follower biased by the collector output of a previous common emitter stage.
#2: Post edited by user avatar jm567‭ · 2020-10-03T04:41:24Z (about 4 years ago)
  • Hello,
  • I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? Is it to limit the current gain? Thanks.
  • Hello,
  • I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I should mention that I am referring to an emitter follower biased by the collector output of a previous common emitter stage. Thanks.
#1: Initial revision by user avatar jm567‭ · 2020-10-03T00:59:19Z (about 4 years ago)
Purpose of emitter resistor in a common collector amplifier
Hello,

I see a lot of ___common collector___ amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? Is it to limit the current gain? Thanks.