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Find the input common-mode range

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Reference no: EM131018004

An npn differential pair employs transistors for which vBE =690mVat iC =1 mA, and β =50. The transistors leave the active mode at vCE  0.3 V. The collector resistors RC =82 kΩ, and the power supplies are±1.2 V. The bias current I = 20 μA and is supplied with a simple current source.

(a) For vB1 = vB2 = VCM = 0 V, find VE, VC1, and VC2.

(b) Find the input common-mode range.

(c) If vB2 =0, find the value of vB1 that increases the current in Q1: by 10%.

Reference no: EM131018004

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