Bipolar Transistors
Bipolar Transistors
Why CMOS offers better advantages over BJT(bipolar junction transistor) as a switch?
What are the factors?
This is because of how the CMOS and BJT work. If you use a N-channel BJT as a switch, if you apply current to the base that means it's "on" and when that happens yo have a voltage drop of 0.7V (approx.) between base-emitter nodes, take that 0.7V and multiply it times the base current and you get the the power the transistor itself is consuming when it's "on". Unlike the BJT the CMOS transistor does not conduct current between the gate (base) and the drain (emitter) because they are isolated by a dielectric (much like a capacitor), thus not consuming any power while in a steady state (either on or off). So there's the answer, a BJT consumes power while "on" and the CMOS doesn't, the CMOS consumes power just in the instant that switches from on to off and viceversa, so they consume more power in high frequency (HF) applications. But regardless of this, CMOS is more often used in HF Integrated Circuits because you can fit more CMOS transistors in a given area rather than using BJTs.
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Lecture-41-Hetrojunction Bipolar Transistors(HBT)-4(Contd)