Biasing Techniques:Collector Feedback Bias
Biasing Techniques:Collector Feedback Bias: In this case, the base resistor is returned back to collector as shown in fig. 1. If temperature increases. βdc increases. This produces more collectors current. As IC increases, collector emitter voltage decreases. It means less voltage across RB and causes a decrease in base current this decreasing IC, and compensating the effect of bdc.
In this circuit, the voltage equation is given by
Circuit is stiff sensitive to changes in βdc. The advantage is only two resistors are used.
It is better as compared to fixed bias circuit.
Circuit is still sensitive to changes in βdc. The advantage is only two resistors are used.