Select the values of RB and RC for a transistor whose VBE = 0.7 V, so that the transistor is operating at point Q as shown in the characteristics shown in the figure (b). Given that the input impedance of the transistor is very small and VCC = VBB = 16 V, also find the voltage gain and power gain of circuit making appropriate assumptions.
Answer:
According to the question, Vbe = 0.7V and Vcc = Vbb = 16V
Also, Vce = 8V
Ic = 4 mA = 4 × 10-3 A
Ib = 30 × 10-6 A
Rc = 2 kilo ohms
Rb = 510 kilo ohms
By using the appropriate expressions, we can easily calculate the following:
Current gain = 1333
Voltage gain = 0.52
Power gain = 69