INPUT-OUTPUT IMPEDANCE OF 3 MODES OF BJT OPERATION

Discussion in 'General Electronics Chat' started by sevensages2007, Apr 27, 2009.

  1. sevensages2007

    sevensages2007 Thread Starter New Member

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    May 13, 2008
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    i want to compare the input & output impedance of CB,CC,CE modes of operation of BJT.PLZ HELP ME
  2. Audioguru

    Audioguru New Member

    Joined:
    Dec 20, 2007
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    Ontario, Canada
    Simply learn about transistors. There are tutorials here and Google has many of them.
    A Common-base transistor has a low input impedance.
    A common-emitter transistor has a medium input impedance.
    A common-collector transistor has a high input impedance.

    The datasheet of the 2N3904 transistor has a graph of its typical input impedance when it is common-emitter at different currents. The tutorials show how to calculate the input impedance.
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