Bjt Current Amplifier Circuit. In this section of electronic devices and circuits it contain a c models ac analysis of bjt circuits and small signal amplifier mcqs multiple choice questions answers all the mcqs multiple choice question answers requires in depth reading of electronic devices and circuits subject as the hardness level of mcqs have been kept to advance level these sets of questions are very helpful in. A current amplifier is somewhat similar to a voltage buffer but the difference is that an ideal voltage buffer will try to deliver whatever current required by the load while keeping the input and output voltages same where a current amplifier supplies the succeeding stage with a current that is a fixed multiple of the input current.
By keeping in mind this discussion lets have a look at this below given circuitry. How to obtain ac equivalent circuit 3. I c sat v ceq r c i cq v ce cutoff v ceq i cqr c where r c is the parallel combination of r c and r l.
A small base current controls a larger typically 100 current in the collector.
Important point to consider is self biased bjt circuit that is depicted below. As we know that ic βi b that mean current is amplified. In standard operation the bjt transistor works as an amplifier. A bipolar junction transistor bjt is a type of transistor that uses both electrons and electron holes as charge carriers in contrast a unipolar transistor such as a field effect transistor uses only one kind of charge carrier a bipolar transistor allows a small current injected at one of its terminals to control a much larger current flowing between two other terminals making the device.
