DIFFERENCE BETWEEN VOLTAGE DIVIDER BIAS AND SELF BIAS CIRCUIT:-
Well First Of All, keeping all these Stuff aside let's know actually what is Voltage Divider:
VOLTAGE DIVIDER:- In electronics, a voltage divider (also known as a potential divider) is a passive linear circuit which produces an output voltage (represented as Vout) that is a fraction of its input voltage (represented as Vin).
It is actually the result of distributing the input voltage among the components of the divider.
A simple example of a voltage divider is two resistors connected in series, with the input voltage applied across the resistor pair and the output voltage emerging from the connection between them.
SELF BIAS:-
Guess what a better method of biasing is obtained by inserting the bias resistor directly between the base and collector so by keeping that collector to the base in that manner, feedback voltage can be fed from the collector to the base to develop a forward bias and this arrangement is called self bias.
The Figure Shown Above is just one example to get some idea of how Self bias Circuit can sometimes LOoks Like.
SO SIMPLY THE DIFFERENCE BETWEEN TWO IS THAT:-
SELF BIAS- The Self Bias Circuit Doesn't provide good stabilization for high base voltage.
Well First Of All, keeping all these Stuff aside let's know actually what is Voltage Divider:
VOLTAGE DIVIDER:- In electronics, a voltage divider (also known as a potential divider) is a passive linear circuit which produces an output voltage (represented as Vout) that is a fraction of its input voltage (represented as Vin).
It is actually the result of distributing the input voltage among the components of the divider.
A simple example of a voltage divider is two resistors connected in series, with the input voltage applied across the resistor pair and the output voltage emerging from the connection between them.
SELF BIAS:-
Guess what a better method of biasing is obtained by inserting the bias resistor directly between the base and collector so by keeping that collector to the base in that manner, feedback voltage can be fed from the collector to the base to develop a forward bias and this arrangement is called self bias.
SO SIMPLY THE DIFFERENCE BETWEEN TWO IS THAT:-
SELF BIAS- The Self Bias Circuit Doesn't provide good stabilization for high base voltage.
So For improving the performance of self bias either increase the base resistor or
decrease the bias supply voltage or both.
VOLTAGE DIVIDER BIAS- The Voltage Divider Bias provides a better stabilization than others
out there, for base voltage where it's level depends on resistor and
resistor can be change by using a variable resistor so that it divides
the supply voltage among two resistors.
(Note: All those topics defined here are gathered from web from different sources and most of the times definitions are being made to understand keeping that in mind,different sources are at one place being set to make you understand better. Well the definitions and notes are of their respective owners and sometimes it's mine creativity ;) ..
3 comments
Thanks for this amazing guide on BJT and Voltage divider biasing. Loved and enjoyed this post. I always love to use this voltage divider calculator for performing my calculations: http://www.voltagedividercalculator.com
I am afraid there is some misunderstanding in the description of biasing. Self biasing is a general terms under which a few actual implementations exist. So, potential divider biasing is one such practical/actual implementation of self-bias.
You should rather contrast self bias with fixed bias instead. What you have shown and described as "self bias circuit" is actually an implementation of the fixed bias.
As a rough definition, self biasing means a biasing mechanism which is sensitive to the internals (internal vatiations/deviations) of the transistor. "being sensitive" in this context means chaning the bias voltages/currents in response to deviations of transistor parameters (such as beta).
On the other, fixed biasing means a biasing mechanism which is insensitive to the transistor's possible deviations/variations of its parameters. So, such a biasing method tends to continuously keep the same bias voltages/currents irrespective of variations.
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