With a common emitter amplifier it's the emitter that is usually grounded.
1 answer
A: When a signal is not amplified but simply taken from an emitter the reason is that the emitter will provide better current capabilities
1 answer
Depending on context, it could be an infra-red emitter. An emitter that emits at a wavelength longer than that of visible red.
infra red emitter is a special pn juction device in which emitter region emits infrared rays
1 answer
1 answer
The emitter resistor in a common emitter configuration provides negative feedback to the transistor, reducing both its voltage gain and distortion.
1 answer
Emitter
1 answer
A common emitter BJT transistor has the emitter ground. So u measure input voltage at base with respect to the ground, i.e; emitter and also u measure the output voltage at collector with respect to the ground, i.e; emitter. Hence, the emitter is common and thus the name.
1 answer
A capacitor has lower resistance (impedance) as frequency increases. Adding an emitter capacitor effectively lowers the emitter resistance as frequency increases. Since gain in a typical common emitter amplifier is collector resitance divided by emitter resistance, this decrease in emitter resistance will increase gain as frequency increases.
1 answer
In a common emitter amplifier, the base-emitter current causes a corresponding collector-emitter current, in the ratio of hFe (beta gain) or collector resistance over emitter resistance, which ever is less. Since this ratio is usually greater than one, the differential collector current is greater than the differential base current. This results in amplification of the base signal.
As you increase the base-emitter current, the collector-emitter current also increases. This results in the collector being pulled towards the emitter, with the result that the differential collector voltage decreases. This results in inversion of the base signal.
2 answers
The advantage of the emitter follower is that it has a positive gain of 1.
1 answer
Because of the geometry of the common collector configuration, changes in base voltage appear at the emitter. Said another way, what happens at the base pretty much happens at the emitter, and the emitter can be said to "mirror" or "follow" the base. The emitter is a follower of the base, and the name emitter follower appeared and was used.
4 answers
The percentage of doping in emitter is higher than collector region.hence large current is flow to emitter than collector.
2 answers
In physics, an alpha emitter is a radioactive substance which decays by emitting alpha particles.
2 answers
The gain of a common-emitter amplifier is collector resistor divided by emitter resistor, or hFe, whichever is less. Since hFe depends on temperature, designing the amplifier to be dependent on resistance ratio makes it more stable. As such, the emitter resistance serves to stabilize the amplifier.
1 answer
What nation is the largest emitter of carbon dioxide?
1 answer
The percentage of doping in emitter is higher than collector region.hence large current is flow to emitter than collector.
1 answer
A: The ratio of emitter/collector resistance is the gain. by adding a capacitor on the emitter the AC parameters will shift as a function of frequency
1 answer
The capacitor is called a bypass capacitor , it provides a low impedence path for AC emitter current to groun.
1 answer
1st pin is emitter then collector and base
1 answer
Bipolar transister consist of emitter base & collecter
1 answer
UJT means Uni Junction transistor terminals are Emitter,Base1 and Base2.UJT is also called double base diode.UJT operates when the emitter is forward biased.voltage is applied between base1 and base2.If an external voltage is applied at terminal E,no current will flow in to the emitter as long as this applied voltage is less than emitter voltage.When this applied voltage exceeds emitter voltage,current will flow into the emitter and holes get injected from emitter to base1 and are repelled by base2.This results in increase in the region between the junction and the base 1.The increase in conductivity results drop in emitter voltage and increased forward bias of the junction.so emitter current also increases.Then it exhibits a negative resistance.
1 answer
The emitter bypass capacitor in a common emitter amplifier will have less resistance as the frequency increases. Since gain in this configuration is collector resistance divided by emitter resistance (within limits of hFe), the gain will thus increase for higher frequencies, making this into a high pass filter.
2 answers
In the common emitter amplifier, an increase of base-emitter current causes a larger increase of collector emitter current. This means that, as the base voltage increases, the collector voltage decreases. This is a 180 degree phase shift.
2 answers
some of emitter current goes out base instead of collector
1 answer
The base current of the emitter current is smaller.
1 answer
emitter follower is a type of negative feedback ,
2 answers
This really belongs in "physics" or "optics", but there doesn't seem to be those categories. My best shot, given I'm not a physics professor: Lambert's Law says that the intensity of emmitted light from a surface is directly proportional to the cosine of the angle between the line of view and the normal to the surface. A Lambertian surface is a surface that follows this rule exactly. In practice, most surfaces are not perfectly Lambertian. This means that the light percieved from a Lambertian surface is constant, because while the radiant energy is smaller as the viewing point goes off 90° (straight-on; viewing angle = 0°; cosine = 1), the apparent area of the surface from that point of view is larger, so the same amount of light is percieved by the viewer.
1 answer
The percentage of doping in emitter is higher than collector region.hence large current is flow to emitter than collector.
4 answers
It is because the emitter is the source of charge carriers and we require to move these charge carriers into base which is obtained only by forward baising the base emitter junction.
1 answer
Limit current through emitter, Often the resistance is the load itself. So the restatnce limits current on what otherwise would act as a voltage follower.
1 answer
The collector voltage is not necessarily approximately zero when a transistor has a collector-emitter short. It depends on whether or not there is an emitter resistor.
A typical collector-emitter circuit has two resistors, one in the collector and one in the emitter. One or both of them might be zero, i.e. not present, depending on design requirements. The collector-emitter junction represents a third resistor, the value of which is dependent on base-emitter vs collector-emitter current ratios and hFe.
If the collector-emitter junction is shorted, then this circuit degrades to a simple voltage divider, or single resistor, and the collector-emitter voltage differential will be approximately zero. Simply calculate the voltage based on the one or two resistances.
Results could be different than calculated, if the resistors are small in camparision to the shorted impedance, and it could be different depending on the base to emitter or collector relationship in that fault state, though the latter case is usually negligible due to the relatively high resistances of the base bias circuit.
1 answer
The emitter and collector pins are the outer pins, and on a metal can transistor, the emitter pin will be closest to the bit of metal that sticks out. For transistors with a flat side, the pins could be either Emitter, Base, then Collector with the flat side facing toward you, or Collector, Base, Emitter, or very rarely something else, so the datasheet should be consulted (search online for whatever is marked on it). On power transistors, it is Emitter, Collector, Base, with the metal tab facing you.
1 answer
An emitter is heavily doped in a transistor to increase its conductivity and allow a large number of charge carriers to flow from the emitter to the base, resulting in a low-resistance path for current flow. This helps in achieving high current gain and improving the overall performance of the transistor.
2 answers
A: Any transistor of either polarity can be used as an emitter follower, The purpose of an emitter follower is to provide current to the load since it cannot provide any voltage gain
1 answer
An object is a good emitter of radiation if it has a high temperature. The higher the temperature of an object, the more thermal radiation it emits.
2 answers
Maybe you ought to not take emitter and base into consideration prior to concluding
1 answer
pnp transister in common emitter mode
1 answer
The emitter resistor is connected to ground(in the case of an rc coupled amplifier).Also input signal applied at the base is grounded.Then the emitter resistor forms a feedback to the input signal (through the ground return path).So emitter resistor is also called feedback resistor.
1 answer
We bias the common emitter amplifier to have a collector-emitter voltage of one half of Vcc in order to set the operating point halfway between the two extremes.
1 answer
The transistor has three regions, emitter,base and collector. The base is much thinner than the emitter while the collector is wider than both. However for the sake of convenience the emitter and collector are usually shown to be of equal size.
The transistor has two pn junctions that means it is like two diodes. The junction between emitter and base may be called emitter-base diode or simply the emitter diode.The junction between base and collector may be called collector-base diode or simply collector diode.
The emitter diode is always forward biased and the collector diode is always reverse biased.
1 answer
The transistor acts like a normal pn diode. in NPN transistor the both n i.e.,collector and emitter ane shorted then they become a n and other is p so pn diode is formed.
When the emitter and the collector of a transistor are short, the emitter current =the collector current.
1 answer
Asking about biasing of the emitter alone does not make sense. When you talk about bias, you talk about a junction, such as emitter-base or emitter-collector or base-collector.
In a bipolar junction transistor (BJT) both the emitter-base and emitter-collector need to be forward biased, otherwise you are operating the BJT in cutoff mode.
Certainly, if you intend to operate the BJT as a switch, then reverse bias for emitter-base (actually, zero bias) could well be one of the valid states, corresponding to a cutoff condition for emitter-collector.
However, operation in linear mode, the other normal way to use a BJT, requires that both the emitter-base and the emitter-collector be forward biased. Of course, depending on the ratio of emitter-base to emitter-collector versus hFe, you could also be saturated, which is a non-linear mode, i.e. an on switch.
2 answers
there is no F/B involved the emitter simply follows the changes on its base.
1 answer
Resistor placed in the emitter lead of a transistor circuit to minimize the effects of temperature on the emitter-base junction resistance.
1 answer
a capacitor that bypasses a BJT's emitter bias resistor so the emitter is at AC ground but has a DC bias voltage on it to set operating conditions. without the bypass, the bias would not stay constant.
1 answer
# parameter are usually the base current ib,collector current ic,emitter current ie,collector emitter voltagevce,base emitter voltagevbe,collector base voltagevcb which decide the operation &output of the transistor
1 answer
to get the base- emitter junction forward bias we should connect the negative of the diode with the negative of the battery and the positive of the diode with the positive of the diode so we should connect negative source in the emitter
1 answer
as we know that in reverse bias condition no current is produced and if it produced by the minority charge carrier then also the current produced is in very less amount so u can say that emitter current will reduced to large extend as compare to emitter current in forward bias condition
1 answer
The (Class C, Common Collector) Emitter Follower is used to amplify the available current from a voltage driving circuit that might be disturbed by the load impedance.
If the actual voltage value is important, the emitter follower is often teamed up with an opamp which sets the emitter voltage based on the input voltage.
1 answer
Kirchoff's current law states that the current in every point in a series circuit is the same.
In the case of a transistor in common emitter configuration, you can take advantage of that fact and state that the collector current is equal to the emitter current. The truth is somewhat different, because the gain of the transistor is not infinity, so the base current must be added to the emitter current. With a reasonably high gain, however, you can ignore the base current.
Consider that the emitter voltage is related to the base voltage by the forward drop of the base-emitter junction, about 0.7 volts, and the collector and emitter currents are the same. Now look at the collector and emitter resistors. If the currents are the same, and the voltage across the emitter resistor is known, then you know the voltage across the collector resistor as well. This is an application of both Kirchoff's and Ohm's laws.
The gain, then, of this amplifer is collector resistance divided by emitter resistance. It is an inverting amplier in this configuration. In some configurations, the emitter resistor is zero ohms. This does not mean the gain is infinity - it now means that the gain is limited by the gain of the transistor, which it is anyway - the emitter resistor is used to stabilize the gain and reduce dependency on individual transistor gains, which do vary.
1 answer