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C3 connects the base to
ground as far as ac is
concerned.
Therefore both input and
output are connected to
the base. (common base
amplifier).
Current gain is
Ic/Ie
which is less than 1.
The voltage gain is high
since it is Rc/Re.
(Approximately the same
current flows through
them). It is typically
250.
The input impedance is
low, typically 20 ohms.
The output impedance is
high, typically 1Megohm.
The output signal is not
inverted with respect
the input.
It is often used to
match low impedance
devices to high
impedance ones.
It is commonly used at
VHF.
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