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Answered 2007-09-03 14:36:22

It is a non-linear device.

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Is base emitter circuit and common base amplifier same?

No the base emitter circuit is not the same as a common base circuit. The three BJT circuits all have the base emitter circuit. Wheter each terminal is common to both inputs and outputs of the circuit determines the type of transistor configuration.Henry Lee Everson PE;229-560-9769

What is common emitter circuit?

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.

How do you draw thevinin equivalent circuit of common emitter amplifier?


What are the effects of an unbypassed emitter resistor?

An emitter resistor in a common emitter circuit will cause the stage to experience the effects of degenerative feedback if it is unbypassed. The degenerative feedback reduces gain. This is probably the primary effect in the described circuit.

Why a capacitor is used for amplification in common emitter circuit?

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

Capacitor from emitter to ground in common emitter circuit is called?

The capacitor is called a bypass capacitor , it provides a low impedence path for AC emitter current to groun.

What is the difference between a CB amplifier and CE and emitter-follower?

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 effect of an unbypassed resistor on the common emitter amplifier circuit?

reduced gain

Why use a npn transistor in a common emitter bjt single stage amplifier circuit?

You can use an npn or a pnp bjt in a common emitter amplifier circuit. The decision of which one to use is based on whether you want the collector and base to be more positive (npn) or more negative (pnp) than the emitter.

What is Common Emitter Amplifier with emitter bypass capacitor?

The amplifier gain characteristics will change due too the bypass of AC signal to ground by the capacitor

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

Common base transistor if the emitter is open current Ie=0 but a small collector current thus exist.this current is reversed biased collector to the base voltage it is represented by Icbo while common emitter is d base terminal is open circuit and the base junction is reversed biased current Icbo flow from the tcollector to the emitter in the external circuit this current is called leakage current.

Why bypass capacitor is used in common emitter ampifier circuit?

If a bypass capacitor is used the voltage drop across emitter resistance is reduced which in turn increases the gain.....

Why would there be a gain when you add the emitter capacitor to a circuit board?

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.

Why base in grounded in common emitter transistor as amplifier?

With a common emitter amplifier it's the emitter that is usually grounded.

What are the characteristics of a common emitter amplifier?

There are a number of characteristics found in a common emitter amplifier. Not only are the parameters considered, but also their performance. Characteristics and performance are: voltage gain/ medium; current gain/ medium; power gain/ high; input / output phase relationship/ 180 degrees; input resistance/ medium; and output resistance/ medium.

Why the output of common base in phase or common emitter out of phase?

The output of a common emitter stage is inverted, it is not out of phase.

What is single tuned voltage amplifier?

it is a circuit consisting of a tuned circuit with a capacitor in parallel with inductor and it is connected to collector terminal in common emitter configuration,, and it is used as frequency receiver

In a common emitter transistor the primary purpose of a resistor connected to the emitter is to?

The emitter resistor in a common emitter configuration provides negative feedback to the transistor, reducing both its voltage gain and distortion.

Why emitter follower is used in circuits?

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.

Frequency response of common emitter with self bias?

Frequency responce of common emitter with self bias?

What do you mean by common emitter configuration and biasing pnp transistors?

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.

What is the inputoutput phase relationship of common emitter common base and emitter follower amplifiers?

Common emitter is the only transistor configuration that has an 180 degree phase difference between input and output. Common base and common collector outputs are in phase with the input.***********************************That is incorrect.The output of the common emitter is inverted, there is no phase shift.

Why output of common emitter amplifier is inverted?

The output of the common emitter amplifier is inverted because, as base-emitter current increases, so does collector-emitter current, which pulls the collector towards the emitter, i.e. down, making it an inverting amplifier.

What is the advantage of common emitter transistor?

common emitter amplifier can be where we want phase shift of 180 and as a current amplifier

What disadvantage does ao common-drain amplifier have compared to a common-emitter amplifier?

Common drain is also called an emitter follower. It has a power gain but the voltage gain is unity. Common emitter produces a voltage gain.