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The base-emitter voltage (V_BE) in a bipolar junction transistor (BJT) is typically around 0.7 volts for silicon transistors when in the active region. This voltage remains relatively constant because it is determined by the built-in potential of the semiconductor junction and the thermal voltage, which is influenced by temperature. As current flows through the junction, the V_BE adjusts slightly to maintain the balance of charge carriers, but it generally stays close to this value under normal operating conditions. Consequently, it is considered constant for practical purposes in circuit analysis.
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Why cc configurationis also called emitter follower?
The common collector (CC) configuration is called an emitter follower because the output is taken from the emitter terminal, which "follows" the input voltage at the base. In this configuration, the emitter voltage closely tracks the base voltage, with a small voltage drop due to the base-emitter junction. This results in a high input impedance and low output impedance, making it ideal for buffering applications. The term "follower" emphasizes the way the output voltage follows the input signal.
Why in common collector amplifier however you change value of resistance not amplifier in voltage?
The question does not quite make sense. It sounds like you are asking why does changing the emitter resistor in a class C common collector amplifier not affect the output voltage? If so, the answer is that the common collector is an emitter follower, meaning that the emitter will follow the base, less the base-emitter junction voltage, within the limits of hFe. The resistor is simply there to ensure output biasing when the base voltage goes low.
Why output voltage in common base amplifier is in phase to input voltage?
The output of a common emitter stage is inverted, it is not out of phase.
Why is collector current increased slowly with the increase of collector to emitter voltage of a common emitter?
The percentage of doping in emitter is higher than collector region.hence large current is flow to emitter than collector.
When testing transistors how much minimum voltage difference should be seen across the base-emitter junction?
It depends on the transistor. Minimum base-emitter junction voltage can be as low as 0.6 volts for a silicon transistor, and as low as 0.2 volts for a germanium transistor.
What is power transistor base emitter voltage?
Its is the emiiter base of the transistor voltage!
Approximate voltage across the forward-biased base emitter?
The approximate voltage across the forward-biased base-emitter junction is 0.7 volts.
Why emitter follower is called so?
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.
Why cc configurationis also called emitter follower?
The common collector (CC) configuration is called an emitter follower because the output is taken from the emitter terminal, which "follows" the input voltage at the base. In this configuration, the emitter voltage closely tracks the base voltage, with a small voltage drop due to the base-emitter junction. This results in a high input impedance and low output impedance, making it ideal for buffering applications. The term "follower" emphasizes the way the output voltage follows the input signal.
When temperature increases voltage across diode with constant current?
The voltage across a semiconductor diode (and across the base/emitter junction of a transistor) decreases as temperature increases: the actual figure is -2mV/°C.
What is an emitter follower?
This is a particular transistor amplifier configuration. In general, the input signal is applied to the base, the collector is connected to a supply voltage, and the output is taken between the emitter and power supply common. One of the characteristics of the emitter follower is the output voltage "follows" the input, but the output is reduced by the Vbe voltage (the voltage drop between base and emitter, approximately 0.7 V for a silicon bipolar transistor).
What does the electronic term Vb mean?
Base voltage in a transistor. There is also Vc (Collector voltage), Ve(Emitter voltage), Ic(Collector current), Ib(Base current), Ie(Emitter current), Vcc(Supply voltage), and Hfe (Forward current gain)
What is the working of a transistor?
For proper working of a transistor,the voltage at the base region must be more positive than that of the emitter region.The voltage at the collector region, in turn, must be more positive than that of the base region.when voltage is applied to transistor, the emitter supplies electron,which is pulled by the base from the emitter as it is more positive than the emitter.This movement of electrons from emitter to collector creates as flow of electricity through the transistor.The current passes from the emitter to the collector through the base.Thus, adjustment of voltage in the base region modifies the flow of the current in the transistor by changing the number of electron in the base region. In this way, small changes in the base voltage can cause large changes in the current flowing out of the collector. We have three transistor element, a.)Emitter b.)Base c.)Collector
Which terminal represents the control input of a bipolar transistor?
baseUmm....Device current results from forward biasing of the emitter-base junction.Thus you can:1. hold the emitter constant and apply control to the base (most common), or2. hold the base constant and apply control to the emitter (common/grounded base circuit, mostly used at high/very high frequencies).
How it is possible to make a constant current source?
ANSWER: one way tie a zener x volts from B+ to ground with a resistor. that gives you a reference voltage using an PNP tie the base to the reference voltage collector goes to the load and the emitter is tied to +B trough a resistor Since the emitter follows the base then the current should be +B volts -zener voltage - Vbe or .6 v. that is it.
Why there is 180 degrees phase shift in common emitter amplifier?
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.
Why in common collector amplifier however you change value of resistance not amplifier in voltage?
The question does not quite make sense. It sounds like you are asking why does changing the emitter resistor in a class C common collector amplifier not affect the output voltage? If so, the answer is that the common collector is an emitter follower, meaning that the emitter will follow the base, less the base-emitter junction voltage, within the limits of hFe. The resistor is simply there to ensure output biasing when the base voltage goes low.
