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The configuration that behaves as a constant current source is (a) Common Emitter (b) Common Base (c) Common Collector (d) Emitter Follower
written 4.6 years ago by gravatar for teamques10 teamques10 ★ 70k •   modified 4.6 years ago
analog electronics
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written 4.6 years ago by gravatar for teamques10 teamques10 ★ 70k

(b)Common Base

1.On small signal analysis of BJT CB configuration, we get the current gain as Ai =$(r_\pi+\beta r_o)\over(r_\pi+(\beta+1)r_o)$

2.The given expression for current gain Ai evaluates approximately to unity

  1. Thus,as output current is almost equal to input current,COMMON BASE CIRCUIT behaves as a constant current source

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