What is active region in BJT?

Between cutoff and saturation along the load line

load line

In graphical analysis of nonlinear electronic circuits, a load line is a line drawn on the characteristic curve, a graph of the current vs. the voltage in a nonlinear device like a diode or transistor. It represents the constraint put on the voltage and current in the nonlinear device by the external circuit.

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Load line (electronics) - Wikipedia

is the active region of the BJT or also known as linear region. For the BJT to operate in the active region, the condition is that the base-emitter junction should be forward-biased while the base-collector junction is reverse-biased.

What means active region?

Active region is that region in which the emitter base junction is forward biased while the collector base junction is reverse biased.

What is the use of active region of transistor?

(iii) Active region. The region between cut off and saturation is known as active region. In the active region, collector-base junction remains reverse biased while base-emitter junction remains forward biased. Consequently, the transistor will function normally in this region.

What is saturation region for 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.

What is cut off saturation and active region?

In cut off region, both emitter to base and base to collector junction is in the reverse bias and no current flows through the transistor. The transistor acts as an open switch. In the saturation region, both the junctions are in forwarding bias,and the transistor acts as a closed switch.

BJT Transistor Operation Modes/Active, Saturation, Cutoff and Reverse Active modes of BJT Transistor

What is pinch off region?

in insulated-gate field-effect transistors (IGFET), "pinch-off" refers to the channel pinching that leads to current saturation behaviour under high source–drain bias. in junction field-effect transistors (JFETs), "pinch-off" refers to the threshold voltage below which the transistor turns off.

What is non saturation region?

The conduction happening in this region is known as sub-threshold conduction. Linear or non saturation region – For an NMOS, as gate voltage increases beyond threshold voltage, channel is formed between source and drain terminals. Now, if there is voltage difference between source and drain, current will flow.

What is linear region in transistor?

Linear region is a part of the active region of a transistor. The active region of transistor is one in which emitter-base junction is forward biased and collector-base junction is reverse biased.

What is breakdown region in transistor?

The Breakdown Region of a transistor is the region where the collector voltage, Vcc, is so large that the collector-base diode breaks down, causing a large, undesired collector current to flow.

What are the three operating regions of a BJT?

The regions of a BJT are called emitter, base, and collector. A discrete transistor has three leads for connection to these regions.

What is stability factor?

Explanation: Stability factor is defined as the rate at which collector current changes when Base to emitter voltage changes, keeping base current constant. It can also be defined as the ratio of change in collector current to change in base current when temperature changes occur.

What is active region in MOSFET?

The active region is characterized by a constant drain current, controlled by the gate-source voltage. The MOSFET operates at the active region when the constraint stated in (2.9) is satisfied.

What is a break region?

[′brāk‚dau̇n ‚rē·jən] (electronics) Of a semiconductor diode, the entire region of the volt-ampere characteristic beyond the initiation of breakdown for increasing magnitude of bias.

What is avalanche breakdown in BJT?

An avalanche transistor is a bipolar junction transistor designed for operation in the region of its collector-current/collector-to-emitter voltage characteristics beyond the collector-to-emitter breakdown voltage, called avalanche breakdown region.

What is quiescent point or Q point?

The operating point of a device, also known as a bias point, quiescent point or Q-point, is the steady-state DC voltage or current at a specified terminal of an active device such as a transistor with no input signal applied.

Why is it called triode region?

it is an operating regime where the drain current is controlled by three terminals instead of two as in the saturation regime. hence the name triode. next to the door of a source, the drain also has an effect because the channel is always uninterrupted between the source and the drain.

What is the difference between ohmic and saturation regions?

Ohmic or linear is the region where ID is a function of vGS and VDS. Id rises ( very ) roughly linearly with VDS, hence the name 'linear'. Saturation is the region of constant ID, determines by VGS-VT.

What is enhancement mode transistor?

The Enhancement Mode Metal Oxide Semiconductor Field Effect Transistor (EMOSFET) is a three-terminal Device viz. Source (S), Gate (G) and Drain (D). The EMOSFET is a voltage controlled device. The EMOSFET can be operated in the enhancement mode only.

What is drain resistance?

Drain resistance is the ratio of change in drain to source voltage to corresponding change in drain current for a constant gate to source voltage.

What is a depletion mode FET?

The switching mosfet that is designed to be in an 'ON' state when the gate voltage applied is zero and can be turned off by pulling the threshold voltage to positive value for NMOS FETs (comparatively more +ve than source) and negative value to PMOS FETs (comparatively more -ve than source).

What is pitch of voltage?

Pinch off voltage: Pinch off voltage is the drain to source voltage after which the drain to source current becomes almost constant and JFET enters into saturation region and is defined only when gate to source voltage is zero.

What is reverse breakdown?

Glossary Term: Reverse-Breakdown-Voltage

Definition. Peak Inverse Voltage (PIV) or Peak Reverse Voltage (PRV) refer to the maximum voltage a diode or other device can withstand in the reverse-biased direction before breakdown. Also may be called Reverse Breakdown Voltage.

What is forward bias?

Forward bias or biasing is where the external voltage is delivered across the P-N junction diode. In a forward bias setup, the P-side of the diode is attached to the positive terminal and N-side is fixed to the negative side of the battery. Here, the applied voltage is opposite to the junction barrier potential.

What is forward bias and reverse bias?

A forward bias has a substantial forward current, while a reverse bias has a minimal forward current. The depletion layer of a diode is substantially thinner while in forward bias and much thicker when in reverse bias. Forward bias decreases a diode's resistance, and reverse bias increases a diode's resistance.

What is difference between BJT and MOSFET?

There are many differences between the MOSFET and BJT. The MOSFET (voltage controlled) is a metal-oxide semiconductor whereas the BJT (current controlled) is a bipolar junction transistor.