Table of Contents
- 1 Why does an emitter base junction have a higher resistance than a collector base junction in a transistor?
- 2 Which is high resistance emitter or collector?
- 3 Why is the emitter has a lower resistance?
- 4 In which region are both the collector base and base emitter junction forward biased?
- 5 Why the gain reduces for low and high frequency in case of amplifier circuits?
- 6 Does an ammeter have high or low resistance?
- 7 Why is the impedance of a BJT always large?
- 8 What is the load resistance of common collector transistor?
Why does an emitter base junction have a higher resistance than a collector base junction in a transistor?
It may be due to reason that Base -Emitter junction is forward biased and forward biasing the juncton offers less resistance and Base-collector junction is reverse biased and in reverse biasing the junction offers high resistance .
Which is high resistance emitter or collector?
as we know emitter is heavily doped and it has the highest resistance as compared to collector,so we have to employ trial and error method to detect BASE,EMITTER and COLLECTOR TERMINALS!!!
What is collector to emitter resistance of transistor?
In your example circuit, the collector-emitter junction can be thought of as a variable resistance whose value depends on the electronical situation present at the amplifier’s output. It also heats up like a resistor: Ic * Vc = the amount of heat generated in Watts, heating up the transistor.
Why resistance is added in the emitter of biasing circuit?
In other words, the addition of this emitter terminal resistance helps control the transistors base biasing using negative feedback, which negates any attempted change in collector current with an opposing change in the base bias voltage and so the circuit tends to be stabilised at a fixed level.
Why is the emitter has a lower resistance?
The emitter base junction is forward biased, which means the electrons flow easily through the junction between the base and emitter, and hence it acts as a low resistance.
In which region are both the collector base and base emitter junction forward biased?
saturation region
Complete step by step answer: In the cut-off region both junctions are reversed biased and in saturation region both base-emitter and base-collector junctions are forward biased as in this region high currents flows as both junctions of the transistor are forward biased and bulk resistance offered is very much less.
What is the purpose of emitter resistor?
The emitter resistor prevents current from increasing when temperature does. When temperature increases, the current increases. This causes the Voltage across the resistor to increase. So the Base-emittet Voltage of the Transistor decreases, which causes the Current through the transistor to decrease again.
How much resistance does a transistor have?
The 1mA DMM will be pulled down to VCEsat, somewhere in the 0.1v to 0.3v range depending on the transistor detail, so will show a ‘resistance’ of perhaps 0.2v/1mA = 200 ohms.
Why the gain reduces for low and high frequency in case of amplifier circuits?
The low input impedance offered by the capacitor {C} present in the circuit and also the transistor gain reduces the output at high frequency are the reason off gain falling down at high frequencies.
Does an ammeter have high or low resistance?
Hint: Ammeter is a device which is used to measure the amount of current passing through the circuit, and it is connected in series with the circuit. As stated, the ammeters have low resistance.
When both emitter and collector junction are forward biased?
Transistor biasing
| EMITTER JUNCTION | COLLECTOR JUNCTION | REGION OF OPERATION |
|---|---|---|
| Forward biased | Forward biased | Saturation region |
| Forward biased | Reverse biased | Active region |
| Reverse biased | Forward biased | Inverse active region |
| Reverse biased | Reverse biased | Cutoff region |
What is common emitter configuration in BJT?
Common Emitter Configuration – shows both Current and Voltage Gain. Common Collector Configuration – shows Current Gain but no Voltage Gain. In a common base mode which is also called grounded base, the base terminal of the BJT is used as the common terminal for both input and output of the configuration.
Why is the impedance of a BJT always large?
There are very small capacitances in a BJT between the collector and the base, and the base and the emitter. Since the capacitor values are very small, their impedance at low and moderate frequencies is large. I.E.: 1 is large if C 1.
What is the load resistance of common collector transistor?
The load resistance of the common collector transistor accepts equally the base and collector currents offering a substantial current gain (just like the common emitter construction) as a result, it exhibits excellent current amplification with only a small amount of voltage gain.
How does the resistance in collector and emitter affect V(CE)?
the resistance in collector will determine the value of your V (CE) which is important for you to determine your quiescent point for your transistor depending on what is your purpose on your transistor. The resistance in emitter is for stability, because BJTs are highly sensitive in temperature and it will affect your current gain.