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As its name suggests, in the Common Base or grounded base configuration, the BASE connection is common to both the input signal AND the output signal with the input signal being applied between the base and the emitter terminals. The corresponding output signal is taken from between the base and the collector terminals as shown with the base terminal grounded or connected to a fixed reference voltage point.
The input current flowing into the emitter is quite large as its the sum of both the base current and collector current respectively therefore, the collector current output is less than the emitter current input resulting in a current gain for this type of circuit of "1" (unity) or less, in other words the common base configuration "attenuates" the input signal.

Show in the picture for the Common Base configuration.

Now answer the questions and add these to 
the comment page below the post.

  1. How the common base configuration works ?
  2. Why current gain is low of this type ?

To take information about  common base configuration  please go below here.

Ian weber
12/3/2012 06:54:49 pm

Check your grammar

Capitalize your button headings

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