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# set13new - ECE3050 Assignment 13 1 The gure shows a current...

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ECE3050 — Assignment 13 1. The f gure shows a current mirror. The transistors are identical. (a) If the base currents and the Early e f ect can be neglected, use the equations I 1 = I S e V BE 1 /V T I 2 = I S e V BE 2 /V T V BE 1 + I 1 R 1 = V BE 2 + I 2 R 2 to show that I 1 exp μ I 1 R 1 V T = I 2 exp μ I 2 R 2 V T (b)If I 1 =1mA , R 1 =1 . 2k ,and V T =25mV ,so lv efo r R 2 for I 2 =20 µ A .A n s w e r : R 2 =64 . 89 k . 2. The f gure shows a current mirror. (a) If the transistors are identical and the Early e f ect can be neglected, label all currents in the unlabeled branches in terms of I O . (b) Write a KCL equation at the collector of Q 1 and use it to solve for I O . (c) What is the minimum β for I O 0 . 99 I REF ?An sw e r : β 198 . (d) What is the small-signal output resistance r out ?An sw e r

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set13new - ECE3050 Assignment 13 1 The gure shows a current...

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