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Explain, in your own words and without any detailed circuit analysis, why the CE-CB cascode amplifier...

Explain, in your own words and without any detailed circuit analysis, why the CE-CB cascode amplifier extends the upper frequency range of the corresponding CE amplifier.   Your explanation should take no longer than half a page and should cover the following points:

  • The disadvantage of using a CB amplifier on its own
  • Why is the 3 dB cut-off larger for the CE when in cascode than when it is on its own?

What is the role of the CB stage in the cascade arrangement?     

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