Discussion in 'General Electronics Chat' started by sevensages2007, Apr 27, 2009.
i want to compare the input & output impedance of CB,CC,CE modes of operation of BJT.PLZ HELP ME
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.