Difference between common emitter common base and common collector transistor
Answers
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Answer:
Common emitter: Is used for power gain; beta is the gain factor; input impedance is medium; as is the output impedance; the amplifier does invert the input. Oh yeah, the emitter circuitry is connect to the power supply common. Common-collector has the collector circuitry connect to common
Explanation:
There is a very scatological memory tool to remember these classes of transistor amplifier designs. I won't type it here so as to not to cause anyone grief. Basically the characteristics are summarized thus:
Common-base refers to a design where the base circuitry is connect to common(sometimes called ground). The input is into the emitter, and output from the collector. We see this in voltage regulators. The characteristics are: Voltage gain; alpha is the gain factor; input impedance is low; output impedance is high; and the amplifier does not invert the input.
Common emitter: Is used for power gain; beta is the gain factor; input impedance is medium; as is the output impedance; the amplifier does invert the input. Oh yeah, the emitter circuitry is connect to the power supply common.
Common-collector has the collector circuitry connect to common. The amplifier is used for current gain; its gain factor is gamma; the input impedance is high; output impedance is low(hence the current gain); it does not invert the input signal.
I hope this summary is useful. The applications for each can be found in numerous places online by googling, or check out Wikipedia for each, such as Common base. Essentially, the "common" indicates which portion of the transistor is connected to the PS common(or ground).
Answer:
The common emitter amplifier and emitter follower will be demonstrated using the same amplifier circuit. The main difference between the two will be where the output is taken. For the common emitter amplifier, we will take the output at the collector of the transistor
Explanation: