INPUT-OUTPUT IMPEDANCE OF 3 MODES OF BJT OPERATION

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

  1. sevensages2007

    Thread Starter New Member

    May 13, 2008
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    0
    i want to compare the input & output impedance of CB,CC,CE modes of operation of BJT.PLZ HELP ME
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    895
    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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