D *7.115 For the circuit in Fig. P7.115, assuming all transistors to be identical with ß infinite, derive an expression for the output current lo, and show that by selecting R1 = R2 and keeping the currents in all junctions equal, the current lo will be Vcc 2R, which is independent of VBg. What must the relationship of RĘ to R1 and R2 be? For VCC= 10 V and VBE = 0.7 V, design the circuit to obtain an output current of 0.5 mA. What is the lowest voltage that can be applied to the collector of Q3? Vcc RE R Figure P7.115

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BJT (Bipolar Junction Transistor)

A BJT is a semiconductor device with 3 terminals that consist of a p-n junction diode that can amplify the signal or current. It is a current-controlled device. The three BJT terminals are base, collector, and emitter. The BJT works with the charge carrier, the two type of carriers in the BJT are holes and electrons, the charge carriers flow by the process of recombination. The signal to be amplifier is generally given as the input at the base terminal and an amplified form of it is available at the collector terminal.