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How do you saturate a BJT?
A transistor goes into saturation when both the base-emitter and base-collector junctions are forward biased, basically. So if the collector voltage drops below the base voltage, and the emitter voltage is below the base voltage, then the transistor is in saturation. Consider this Common Emitter Amplifier circuit.
What happens when the Q point of BJT is closed to the cutoff or saturation region?
Q-point in cut-off and saturation region The output waveform of VCEQ & ICQ are distorted when Q-point is in either cut-off or saturation region. If Q-point is in cut-off region, negative half cycle of ICQ and positive half cycle of VCEQ are distorted and vice versa for saturation region.
What is saturation collector current?
As the transistor’s base current increases, a collector current of hFE times as much as the base current flows. As the collector saturation voltage (VCE (sat)) becomes larger, some of the power supply voltage is used by VCE (sat) and becomes residual voltage when the transistor is turned on by a switching operation.
What is BJT saturation current?
In a nutshell, “saturation” for a BJT is the point where a further increase in base current will not result in a corresponding increase in collector current. That’s because Vce is as low as it’s going to go for that particular Ic.
How does BJT work in saturation mode?
Saturation refers to a region of operation where maximum collector current flows and the BJT acts like a closed switch from collector to emitter . In this mode the BC junction forward biases and maximum current flows. The collector current cannot increase any more, even with an increase in base current.
Why does BJT is called bipolar?
It’s called bipolar because the conduction takes place due to both electrons as well as holes. BJT’s are used in a discrete circuit designed due to availability of many types, and obviously because of its high transconductance and output resistance which is better than MOSFET.
What is the difference between an UJT and a BJT?
UJT stands for unijunction transistor, while in BJT stands for bipolar junction transistor. UJT is only one junction is present in BJT, while in BJT consist of two junctions. It is two junction transistors.
When to use a BJT or FET?
BJTS and FETs can be used as switches and amplifiers in electrical and electronics circuits. The major difference between BJT and FET is that in a field-effect transistor only majority charge carries flows, whereas in BJT both majority and minority charge carriers flow.