Quick Answer: What Is Reverse Active Region?

Why VCE SAT is 0.2 V?

Because the charge carriers injected from the base effectively eliminate the depletion zone between the collector and emitter.

The collector current doesn’t have to overcome the P-N junction potential because the base current has neutralized it..

What is the reason for reverse saturation current?

In a PN junction diode, the reverse saturation current is due to the diffusive flow of minority electrons from the p-side to the n-side and the minority holes from the n-side to the p-side. … In a well made diode, the reverse saturation current is caused by thermally generated electron-hole pairs.

Why Q point is important?

The Q point is essential to the overall component and circuit functionality. It ensures that non-linear components like diodes operate at their optimal current and voltage throughout the operating range. This also promotes increased functionality, reliability, and life cycle of your electronic circuits.

What is meant by stability and Q point?

This operating point is also called as quiescent point or simply Q-point. … The operating point should not get disturbed as it should remain stable to achieve faithful amplification. Hence the quiescent point or Q-point is the value where the Faithful Amplification is achieved.

Why is VBE 0.7 V?

For an unbiased transistor, considering only the BE junction which is a pn junction diode, 0.7V is the potential barrier. In an npn transistor base is positive(p) and emitter is negative(n). … But in a pnp transistor the base is negative(n) and emitter is positive(p) so the vbe=-0.7V.

What is IC saturation?

Yes – there are two different meanings of the term “saturation” – dependent on the transistor type: BJT or FET. … BJT (with collector resistor): Increasing Vbe (or Ib) leads to rising collector current Ic, which causes a continuous decrease of the collector-emitter voltage Vce – until a lower limit is reached at app.

What is ΒDC equal to?

βdc is the amplification factor by which the base current gets amplified by. So the total output current, IC will be IC=βdc x IB.

What is the reverse current of a diode?

Zero Biased Junction Diode This is known as the “Reverse Current” and is referenced as IR. This transfer of electrons and holes back and forth across the PN junction is known as diffusion, as shown below.

What is cut off saturation and active region?

In cutoff, the transistor appears as an open circuit between the collector and emitter terminals. In the circuit above, this implies Vout is equal to 10 volts. 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.

What is reverse saturation current in BJT?

reverse saturation current is a current flow due to minority carrier from a neutral region to enlarging depletion region, this minority carriers are formed at junction due to thermally produced electrons and holes.

Is VBE always 0.7 V?

VBE is the voltage that falls between the base and emitter of a bipolar junction transistor. VBE is approximately 0.7V for a silicon transistor. For a germanium transistor (which is more rare), VBE is approximately 0.3V. Again, this formula, can be used for either silicon or germanium transistors.

What does bias mean?

Bias, prejudice mean a strong inclination of the mind or a preconceived opinion about something or someone. A bias may be favorable or unfavorable: bias in favor of or against an idea.

What is cut off in transistor?

A transistor in cutoff mode is off — there is no collector current, and therefore no emitter current. It almost looks like an open circuit. To get a transistor into cutoff mode, the base voltage must be less than both the emitter and collector voltages.

How do you know if a transistor is in active mode?

A transistor is said to be in its active mode if it is operating somewhere between fully on (saturated) and fully off (cutoff). Base current regulates collector current. By regulate, we mean that no more collector current can exist than what is allowed by the base current.

What causes reverse current?

Reverse current is when there is a higher voltage at the output of a system than at the input, causing current to flow backwards through the system. … One source is when system input power is disconnected, a higher voltage can be left at the output, which temporarily produces reverse current.

What is active region?

Active region This is also called as linear region. A transistor while in this region, acts better as an Amplifier. This region lies between saturation and cutoff. The transistor operates in active region when the emitter junction is forward biased and collector junction is reverse biased.

What is quiescent operating point?

The operating point of a device, also known as bias point, quiescent point, or Q-point, is the DC voltage or current at a specified terminal of an active device (a transistor or vacuum tube) with no input signal applied. A bias circuit is a portion of the device’s circuit which supplies this steady current or voltage.

What is active mode in transistor?

Typically we want to have a transistor to operate in what is called active mode. Active mode is when the Base-Emitter junction is forward biased and the Base-Collector Junction is Reverse biased. For the npn this means that the Base has a higher potential than the Emitter and a lower potential than the collector.