cmos is from mos family and its unipolar
bjt is current control device
cmos is voltage control device
bjt is used for high current application
cmos is used for high voltage
bjt has not high input impedance
cmos has high input impedace
bjt has some what more static power consumption
cmos has zero static power consumption prominient advantage
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Disadvantage:Easy to damage when compared to BJT
BJT is Bipolar junction transistor FET is Field effect Transistor It is a current controlled device It is voltage controlled device
it is an oscillator
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bjt is bipolar device whr fet is unipolar....fet is input resistance thts y fet gain is less compared to bjt..... The applications that will prefer bipolar junction transistors to field effect transistors are applications that require fast switching.