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Diff. B/W CE,CB,CC?

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What are the Differences B/W Common Emitter, Common Collector, Common Base? Exact Differences
" Can anyone Give the Diag. for All these in Different Biasing Methods like FIXED BIAS, EMITTER BIAS, VOLTAGE DIVIDER BIAS "?
And Explain them Briefly?

I Think i should have to get 3x3 = 9 Diagrams !
(Like., CE Configuration in FIXED BIAS, EMITTER BIAS, VOLTAGE DIVIDER BIAS and other Two)
 
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A common base amp has low input impedance, high output impedance and voltage gain, but no power gain.

A common emitter amp has a relatively high input impedance, high output impedance, and can have both voltage and power gain.

Common emitter amps (also known as an emitter-follower) have a high input impedance and low output impedance. The voltage gain is slightly less than one (usually 0.9__), but it has current and power gain. It is used to buffer high impedance sources to low impedance loads.

Phew, what a good review of first semester.
 

crutschow

Well-Known Member
Most Helpful Member
A common base amp has low input impedance, high output impedance and voltage gain, but no power gain.

A common emitter amp has a relatively high input impedance, high output impedance, and can have both voltage and power gain.

Common emitter amps (also known as an emitter-follower) have a high input impedance and low output impedance. The voltage gain is slightly less than one (usually 0.9__), but it has current and power gain. It is used to buffer high impedance sources to low impedance loads.

Phew, what a good review of first semester.
You missed something in that first semester.

Perhaps you meant that a common-base amp does not have current gain but it can indeed have power gain. Since the input is low impedance and power = I²R, then the output power for a given current is greater than the input power if the output collector load has a higher resistance than the transistor input resistance.
 
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mneary

New Member
Common emitter amps (also known as an emitter-follower) have a high input impedance and low output impedance. The voltage gain is slightly less than one (usually 0.9__), but it has current and power gain. It is used to buffer high impedance sources to low impedance loads.
You were probably thinking common collector, which is also known as emitter follower.

Phew, what a good review of first semester.
:eek:
 

Roff

Well-Known Member
A common base amp has low input impedance, high output impedance and voltage gain, but no power gain.

A common emitter amp has a relatively high input impedance, high output impedance, and can have both voltage and power gain.

Common emitter amps (also known as an emitter-follower) have a high input impedance and low output impedance. The voltage gain is slightly less than one (usually 0.9__), but it has current and power gain. It is used to buffer high impedance sources to low impedance loads.

Phew, what a good review of first semester.
All three configurations can have power gain.
 
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