What is the relation between collector current and emitter current?

Generally, the current that flows from the emitter to the collector or vice versa is the base current times the DC current gain (hFE). Note, however, that hFE varies with the collector-emitter voltage (VCE).

Is collector current equal to emitter current?

The common emitter configuration has a current gain approximately equal to the β value of the transistor itself. However in the common collector configuration, the load resistance is connected in series with the emitter terminal so its current is equal to that of the emitter current.

Is emitter current is the sum of collector current and base current?

Detailed Solution. The emitter current is equal to the sum of base current and collector current.

What is the relation between currents ie IC and IB of emitter collector and base of BJT?

Figure 2 NPN Bipolar Transistor circuit. Note: “Ic” is the current flowing into the collector terminal, “Ib” is the current flowing into the base terminal and “Ie” is the current flowing out of the emitter terminal.

What is the difference between emitter and collector?

The main differences between emitter and collector are doping concentration and size. The emitter is heavily doped, while the collector is lightly doped. You could try to swap them, but you’ll get a very low HFE, probably even less than 1.

What is alpha and beta in BJT?

Alpha of a transistor is the current gain in common base configuration defined as the ratio of change in collector current to change in emitter current while beta is the current gain in CE configuration. It is defined as the change in collector current to base current.

Is emitter current greater than collector current?

We know that the concentration of the impurities in the collector is slightly less than the concentration in the emitter. Hence, even if you apply the battery at the junction of the collector and the base in forward bias, the emitter current will always be greater than the collector current.

What is common emitter current gain?

The current gain of the common emitter amplifier is defined as the ratio of change in collector current to the change in base current. The voltage gain is defined as the product of the current gain and the ratio of the output resistance of the collector to the input resistance of the base circuits.

What is emitter base and collector?

The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply. By sending varying levels of current from the base, the amount of current flowing through the gate from the collector may be regulated.

What is the correct relation between IE IC and IB?

A transistors current gain is given the Greek symbol of Beta, ( β ). As the emitter current for a common emitter configuration is defined as Ie = Ic + Ib, the ratio of Ic/Ie is called Alpha, given the Greek symbol of α. Note: that the value of Alpha will always be less than unity.

What is the relationship between IC IB and IE?

Where: “Ic” is the current flowing into the collector terminal, “Ib” is the current flowing into the base terminal and “Ie” is the current flowing out of the emitter terminal.

Is collector current greater than emitter current?

Note : We know that the concentration of the impurities in the collector is slightly less than the concentration in the emitter. Hence, even if you apply the battery at the junction of the collector and the base in forward bias, the emitter current will always be greater than the collector current.

What causes emitter current to be less than collector current?

When the emitter current flows into the base terminal and doesn’t perform as collector current. This current is always less than the emitter current which causes it. The gain of the common base configuration is always less than 1.

What is the common emitter configuration of transistor?

Thus, the emitter is common to both the input and the output circuit, and hence the name is the common emitter configuration. The common emitter arrangement for NPN and PNP transistor is shown in the figure below. The base current amplification factor is defined as the ratio of the output and input current in a common emitter configuration.

What is the output current of common emitter amplifier?

In common emitter (CE) configuration, input current or base current is denoted by I B and output current or collector current is denoted by I C. The common emitter amplifier has medium input and output impedance levels. So the current gain and voltage gain of the common emitter amplifier is medium.

What is the difference between common emitter configuration and common base configuration?

In common emitter (CE) configuration, the input current (IB) is very small as compared to the input current (IE) in common base (CB) configuration. The input current in CE configuration is measured in microamperes (μA) whereas the input current in CB configuration is measured in milliamperes (mA).