Consider the bipolar diff-amp with an active load and a pair of offset-null terminals as shown in
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Consider the bipolar diff-amp with an active load and a pair of offset-null terminals as shown in Figure 14.22 in the text. Let \(R_{1}=R_{2}=500 \Omega\) and let \(R_{x}\) be a \(50 \mathrm{k} \Omega\) potentiometer.
(a) If the wiper arm of the potentiometer is exactly in the center, determine the effective resistances \(R_{1}^{\prime}\) and \(R_{2}^{\prime}\).
(b) Assume \(I_{Q}=250 \mu \mathrm{A}\) meaning that \(i_{C 1}=i_{C 2}=125 \mu \mathrm{A}\). Let \(I_{S 3}=\) \(2 \times 10^{-14} \mathrm{~A}\) and \(I_{S 4}=2.2 \times 10^{-14} \mathrm{~A}\). Determine the required values of \(x\) and \((1-x)\) of the potentiometer to compensate for the transistor mismatches.
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Related Book For
Microelectronics Circuit Analysis And Design
ISBN: 9780071289474
4th Edition
Authors: Donald A. Neamen
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