Collector Feedback Bias:

In this case, the base resistor is returned back to collector as shown in figure. If the temperature increases β_dc increases. This generates more collectors current. As I_C increases, the collector emitter voltage decreases. It means less voltage across R_B and causes a decrease in the base current this decreasing I_C, and compensating effect of b_dc.

Figure 

In this circuit, the voltage equation can be given by

The circuit is stiff and sensitive to changes in β_dc. The advantage is only two resistors are used. Then,

Therefore,

It is enhanced when compared to fixed bias circuit. Further,

Circuit is still sensitive to changes in β_dc. The advantage is only two resistors are used.

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