The current gain of a Darlington pair in common emitter configuration is approximately:

Concept:

• A Darlington pair is two transistor circuit with the emitter of one transistor connected to the base of another transistor, while both collector terminals are connected to the common terminal
• It has high current gain β; (equal to the product of the current gain of individual transistors)
• It also has high input impedance and low output impedance
• The current gain of a Darlington pair in common emitter configuration is approximately β2
• It also has high input impedance and low output impedance