bcause amplification factor beta is usually ranges from 20-500 hence this configuration gives appericiable current gain as well as voltage gain at its output on the other hand in the Common Collector configuration has very high input resistance(~750 kilo ohm) & very low output resistance(~25 ohm) so the voltage gain is always less than one & its most important application is for impedance matching for drivingh from low impedance load to high impedance source
Amplifier, mostly as a switch, does not amplify gain. Gain is a word for describing the amplification factor.
It is voltage or current which is amplified in an electronic circuit. Gain is the factor by which amplification increases the voltage or current.
e.g., if a signal voltage is amplified by 3 times, the gain is 3.
A common emitter amplifier is inverting and has low input impedance, high output impedance, high voltage gain, and high current gain.
It is where an amplifier made with transistors, have the emitters common to the negative rail. (NPN silicon).
No. The common emitter amplifier is so named because the emitter is common to both the input and the output.
i.e. the input is between emitter and base, and the output is between emitter and collector.
A common-collector amplifier, also called an emitter follower, has the collector in both the input circuit and the output circuit.
It is normally used as a buffer, because it has a high input impedance, low output impedance, a voltage gain of 1 but an appreciable power gain.
Emitter followers can become unstable with a capacitve load, which can form an unwanted Colpitts oscillator with the stray capacitances.
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.
emitter follwer
The signal gain of a CE BJT amplifier is hFe or collector resistance divided by emitter resistance, whichever is less.
Applied input signal at the base of the amplifier appears across the emitter resistor (RE) due to inter electrode capacitance so it should be bypassed the emitter resistor (RE) through the bypass capacitor (CB). unbypassed signal will be amplified (common emitter amplifier) and reverse back from the emitter to the collector through the base, amplified signal from the emitter to the collector (common emitter amplifier) is 1800 out of phase to the amplified signal from the base to the collector (common base amplifier), so reduced the gain.
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.
With a common emitter amplifier it's the emitter that is usually grounded.
A: REFERS TO A common emitter amplifier
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.
I think you mean a common emitter amplifier, which is an amplifier of voltage. Emitter-follower or common collector amplifiers are used to match impedances, or to amplify power or current. The emitter-follower is a type of common emitter circuit that has a resistor between the emitter and ground. The output signal is taken from the point between the emitter and its resistor.
what is the other name of common emitter amplifier
Itamplifiesthe gain
Common Emitter - Class A Amplifier.
emitter follwer
bbc
b'cose the gain of the amplifier is high ..
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.
common emitter