What is the disadvantage of driving a transistor in Saturation?

What is the disadvantage of driving a transistor in Saturation?

What is the disadvantage of driving a junction transistor into saturation? Junction transistors used in the variable frequency drive can be driven into the saturation by providing excessive base-emitter current so that the base-collector junction becomes forward biased.

Why is it desirable to drive a transistor into saturation when it is used for switching?

Saturation Characteristics With a zero signal applied to the Base of the transistor it turns “OFF” acting like an open switch and zero collector current flows. When used in this way, the transistors open collector output can thus “sink” an externally supplied voltage to ground thereby controlling any connected load.

What happens in the saturation region of BJT?

The second region is called “saturation”. This is where the base current has increased well beyond the point that the emitter-base junction is forward biased. In fact, the base current has increased beyond the point where it can cause the collector current flow to increase.

Which of the following condition is true for the saturation region of BJT?

Which of the following is true for the saturation region of BJT transistor? Solution: The collector current is directly proportional to the base current in the saturation region of the BJT.

How do you drive a saturation transistor?

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.

When does a NPN transistor go into saturation?

9 Answers. 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.

How much voltage drop across NPN BJT C & E?

In any event, at no time was the transistor driven into saturation, which would result in a collector-emitter voltage on the order of 0.5 volts or less. Repeat this experiment with a 1 kΩ resistor between the collector and Vcc and raise Vcc to 10 V so you can get 10 mA of collector current at saturation.

Which is more positive in a bipolar NPN transistor?

Also the Collector supply voltage is positive with respect to the Emitter ( V CE ). So for a bipolar NPN transistor to conduct the Collector is always more positive with respect to both the Base and the Emitter.

What is the relationship between base and emitter in NPN?

The voltage between the Base and Emitter ( VBE ), is positive at the Base and negative at the Emitter because for an NPN transistor, the Base terminal is always positive with respect to the Emitter. Also the Collector supply voltage is positive with respect to the Emitter ( VCE ).