|1.||Unipolar device (current conduction is only due to one type of majority carrier either electron or hole||Bipolar device (current condition, by both types of carriers, i.e. majority and minority-electrons and holes)|
|2.||The operation depends on the control of a junction depletion width under reverse bias.||The operation depends on the injection of minority carriers across a forward biased junction.|
|3.||Voltage driven device. The current through the two terminals is controlled by a voltage at the third terminal (gate).||Current driven device. The current through the two terminals is controlled by a current at the third terminal (base).|
|4.||Low noise level||High noise level.|
|5.||High input impedence (due to reverse bias)||Low input impedance (due to forward bias).|
|6.||Gain is characterised by transconductance.||Gain is characterized by voltage gain.|
|7.||Better thermal stability.||Less thermal stability.|
Please log in to add an answer.