Answer. Answer: If both junctions are reverse biased the transistor is switch off since the currents will be very small in the order of the reverse saturation current and the reverse is true that is the transistor will be switch on and saturated when the 2 junctions are forward biased.
Q. What happens to current in reverse bias?
Reverse bias usually refers to how a diode is used in a circuit. If a diode is reverse biased, the voltage at the cathode is higher than that at the anode. Therefore, no current will flow until the electric field is so high that the diode breaks down.
Table of Contents
- Q. What happens to current in reverse bias?
- Q. What happens if you reverse bias a transistor?
- Q. What is bias in a transistor?
- Q. What is biasing and why it is needed?
- Q. Why is self bias preferred?
- Q. What are the advantages and disadvantages of fixed bias circuit?
- Q. What is the difference between self bias and fixed bias?
- Q. What is self bias?
- Q. What are the disadvantages of fixed bias circuit?
- Q. What are the advantages of self bias?
Q. What happens if you reverse bias a transistor?
If you reverse bias the diode, the diode cuts off. Now, the base-emitter junction in a transistor is going to essentially turn the transistor on or off. Now, the base-collector junction will not have that same power, but the base-emitter junction will determine whether the transistor is turned on or off.
Q. What is bias in a transistor?
Transistor Biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC input signal can be amplified correctly by the transistor.
Q. What is biasing and why it is needed?
Biasing is the process of providing DC voltage which helps in the functioning of the circuit. A transistor is based in order to make the emitter base junction forward biased and collector base junction reverse biased, so that it maintains in active region, to work as an amplifier.
Q. Why is self bias preferred?
To ensure absolute stability of the amplifier, a stability factor of less than 25 is preferred, and so small-signal transistors have large stability factors. Usage: Due to the above inherent drawbacks, fixed bias is rarely used in linear circuits (i.e., those circuits which use the transistor as a current source).
Q. What are the advantages and disadvantages of fixed bias circuit?
Advantages of Fixed Base Bias: The biasing circuit of fixed base bias is very simple because it only requires one resistor RB. The calculation of this bias method is very simple. There is no loading effect at input side because no resistor is present in the Base-Emitter junction.
Q. What is the difference between self bias and fixed bias?
Fixed bias circuits get their bias voltages from independently designed reference voltage sources (or even something as simple as a voltage divider). Self biased circuits get their bias voltages from the circuit itself, often in the form of a negative feedback.
Q. What is self bias?
Self-biasing refers to means which provide this DC voltage without the need for a DC supply. Now the circuit you attached needs some further assumptions in order to be explained. If the source were an ideal voltage source, its negative halfwave would likely destroy the diode.
Q. What are the disadvantages of fixed bias circuit?
Demerits: The collector current does not remain constant with variation in temperature or power supply voltage. Therefore, the operating point is unstable. Changes in supply will change base current and thus cause emitter current to change.
Q. What are the advantages of self bias?
An advantage of this method of biasing is that the bias automatically adjusts to any variations in the circuit. Suppose, for example, that the plate potential drops from 250 volts to 200 volts. If the bias voltage were fixed, this might well over-bias the tube.
