In this method, one end of RB is connected to the base and the other
end to the collector as shown in Fig. 9.19. Here, the required zero
signal base current is determined not by VCC but by the collectorbase
voltage VCB. It is clear that VCB forward biases the base-emitter
junction and hence base current IB flows through RB. This causes the
zero signal collector current to flow in the circuit.