Using the Hybrid- p Model. r bb and r o are omitted (insignificant) R B represents parallel combination of R B 1 and R B 2 At high frequencies C 1 , C 2 and C 3 approximate short circuits. Problem : C BC influences the input and output halves of the circuit.
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i.e. exactly the same as common emitter amplifier.
i.e. same as C-E but non-inverted.