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How do we compute the voltage gain of a simplified CB amplifier?(a) RB || re‘(b) RC || re‘(c) RB / re‘(d) RC / re‘This question was addressed to me at a job interview.My query is from Simplified Calculations for the CB Configuration topic in section Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

Right answer is (d) RC / re‘

The best explanation: The voltage gain of a simplified COMMON base (CB) amplifier can be expressed in terms circuit RESISTOR values. The base impedance is RC / re‘. Where RC is the equivalent CURRENT resistance and re‘ is the ALTERNATING current resistance of the emitter-base diode.



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