I. Consider the Widlar current source in Figure 10.9 (Textbook), with parameters given in Example 10.5 (Textbook). Choos

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I Consider The Widlar Current Source In Figure 10 9 Textbook With Parameters Given In Example 10 5 Textbook Choos 1 (157.15 KiB) Viewed 60 times

I. Consider the Widlar current source in Figure 10.9 (Textbook), with parameters given in Example 10.5 (Textbook). Choose appropriate transistor parameters. Connect a 50 k resistor between V* and the collector of Q₂ as a load. Using a computer simulation, determine IREF, lo, VBE1, and VBE2. V+ || Icz=lo -OV C2 = Ex 10.5: Consider the circuit in Figure 10.10. Assume the reference current is IREF 120 μA and assume the transistor parameters are Is₁ = Is2 = 2 × 10-¹6 A. Neglect base currents. (a) Find VBE1. (b) If Io = 50 µA, determine V£2 and RẼ. (c) Find Io if RE = 700 2. What is VBE2? (Ans. (a) VBE1 = 0.7051 V; = (b) RE = 455 S2, VBE2 = 0.6824 V; (c) Io = 40.4 μA, VBE2 = 0.6768 V) Rɛ IREF www ICIL 21 R₁ + VBE1 Ro + VBE2 22 IE2. RE V- Figure 10.9 Widlar current source