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Engineering · Electrical Engineering
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3. BUT Differential Pair (25) In the following circuit that is powered by a dual voltage supply of E 10 V, the DC power consumption is characterized as 40 mw. Rc- 5 ka and load Ru 10 k 2 The Early resistance of the BUTs can be neglected. Its desired that the circuit achieve a differential voltage gain of 50 VN. 1) Determine the DC voltage at the collectors of Q1 and Q2. 2) What is the maximum common-mode input voltage for Q1 and Q2? 3) Design Re so that the differential gain can be achieved. 4) If B 100, what is the input resistance? output 5) If the Ro connected to Q2 is 2% larger than the one connected to Q1 what is the offset with zero input? What is the equivalent ac input offset? 10 V the Rc This w/o Re. Care Vos RL Q1 10000 C be Vid Re Re 10000 10 V

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