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Which is high resistance emitter or collector?
In the active state of the transistor the emitter base junction acts as a low resistance while base collector junction acts as a high resistance.
What is base emitter resistance?
The base-emitter resistance can be calculated but usually a transistor has an emitter resistor to provide some negative feedback and it increases the input impedance. I simply look at the input impedance/collector current graph in the datasheet of the 2N3904 transistor.
How do you calculate emitter resistance?
Emitter Resistance Stabilisation This resistance is known as the Emitter Resistance, RE. The addition of this emitter resistor means that the transistors emitter terminal is no longer grounded or at zero volt potential but sits at a small potential above it given by the Ohms Law equation of: VE = IE x RE.
What is resistance collector?
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.
What is the on resistance of a transistor?
What is ON Resistance? The resistance value between the Drain and Source of a MOSFET during operation (ON) is called the ON Resistance (RDS(ON)). The smaller this value is, the lower the (power) loss.
What is the significance of emitter resistance?
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.
Is the collector-emitter junction a variable resistance?
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: I c * V c = the amount of heat generated in Watts, heating up the transistor.
How is the emitter different from the base and collector?
Working of Transistor Emitter: Emitter terminal is the heavily doped region as compared two base and collector. This is because the work of the emitter is to supply charge carrier to the collector via the base. The size of the emitter is more than base but less than the collector.
What is the base emitter resistance of a transistor?
The base–emitter voltage is about 0.7 V, being the voltage drop of a forward biased P–N junction. There is some base– emitter resistance, so the forward voltage drop will increase slightly with base current. Matched bipolar transistors can be very useful, particularly in current mirror circuits.
How is the emitter current related to the load resistance?
Where: IE is the actual emitter current. Now if the supply voltage Vcc increases, the transistors collector current Ic also increases for a given load resistance. If the collector current increases, the corresponding emitter current must also increase causing the voltage drop across RE to increase.