application of collector-feedback biasing

hgmjr

Joined Jan 28, 2005
9,029
Is this your question?

"Is there any reason to use collector-feedback other than to set the gain of a common emitter transistor ampilifer?"

If I have misphrased your question, can you please restate it?

hgmjr
 

hgmjr

Joined Jan 28, 2005
9,029
Originally posted by den@Mar 4 2006, 02:46 PM
true.
[post=14662]Quoted post[/post]​
I know of no other reason to use a collector-to-base feedback resistor in a common emitter amplifier than to set and stabilize the gain of the transistor amplifier.

By the term "stabilize", I mean that the collector feedback resistor minimizes changes in the amplifier's gain due to variations in beta due to temperature as well as variations of beta that occur between different transistors bearing the same part number.

hgmjr
 

aac

Joined Jun 13, 2005
35
Originally posted by den@Mar 4 2006, 02:13 PM
any?
[post=14660]Quoted post[/post]​
Collector feedback also lowers the output impedance and input impedance of the amplifier, so it can be used to control these. If you include capacitors or inductors in the feedback circuit, you can also control bandwith. If you include nonlinear elements, you can make things like log, exponential, or multiplier circuits.
 
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