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Step 1 of 2 6.004P The relation between saturation current and junction area is, Two transistors are fabricated with the same technology, but having different junction areas. The saturation current for the first transistor is, (1) The saturation current for the second transistor is, (2) Active mode operated first transistor has an Emitter-Base junction (EBJ) area, equal to 200 Active mode operated second transistor has Emitter-Base junction (EBJ) area, equal to 0.4 µm 0.4 Divide equation (1) by (2). = = Hence, the saturation current, in terms of is Step 2 of 2 The relation between collector current ic and base-emitter voltage for active mode operated transistor is, Collector current for first transistor is (3) Collector current for second transistor is (4) Two transistors operate in active mode and conduct equal collector currents and hence Divide equation (4) by equation (3). = 1 = Apply natural log to the equation Thus, the difference in the values of two transistors is 12.43 V