Emitter Feedback Bias:

Figure 1, shows emitter feedback bias circuit. In this circuit, voltage across the resistor RE  is used to offset the changes in b_dc. If the b_dc increases, the collector current increases. This increases emitter voltage which decreases the voltage across the base resistor and reduces the base current. The reduced base current result in the less collector current, which offsets the original increase in bdc partially. The feedback term is used because output current ( I_C) creates a change in input current ( I_B ). R_E is common in both input and output circuits.

Figure 1

In this case

Since I_E = I_C + I_B

Therefore,

In this case, S is less compared to fixed bias circuit. Thus the stability of the Q point is better. Further,

If I_C is to be made insensitive to β_dc than

R_E cannot be made large enough to swamp out the effects of β_dc without saturating the transistor.

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