4. BJT Current Mirror (15) In the Wilder current mirror as shown below, the ratio of BE junction areas of the BJTs is a

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4 Bjt Current Mirror 15 In The Wilder Current Mirror As Shown Below The Ratio Of Be Junction Areas Of The Bjts Is A 1 (43.33 KiB) Viewed 35 times

4. BJT Current Mirror (15) In the Wilder current mirror as shown below, the ratio of BE junction areas of the BJTs is a = Aend/Ac = 2. For both BJT. B = 100. The Early voltage is Vs = 5.0 V for Q2. The current mirror is powered by a 12 V DC voltage source 1) (5) Assume QI has a constant Vus1 = 0.7 V. Design Ref 80 that an Tre=1 mA is established as the reference current. (Note: Ve is not 0.7 V.) 2) (5) Design Re so that the current mirror can provide an output current l. = 50uA. 3) (3) Estimate the output resistance of the current mirror R. (looking into the collector of Q2-) 4) (2) What are the main merits of this modified current mirror compared to the conventional BJT current mirror? 12 V Irat 1. Rret RO Q1 Q2 RE VE