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Old 04-27-2009, 09:01 AM
sevensages2007 sevensages2007 is offline
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i want to compare the input & output impedance of CB,CC,CE modes of operation of BJT.PLZ HELP ME
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Old 04-27-2009, 03:02 PM
Audioguru Audioguru is offline
Join Date: Dec 2007
Location: Ontario, Canada
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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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