Assume b >> 1, Vp = 0.7 volts, all npn junction areas identical, and all pnp junction areas are BE(on) identical. VCC = 12 volts. Also assume IREF = 0.5 mA and Circuit 3 current, I3 = 50 µA. Compute:

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BJT Current Mirror System
R2
CIRCUIT 1
Q5
IREF = 0.5 mA
Q4
R1
Q6
CIRCUIT 2
CIRCUIT 3
VcC
Q1
Q2
Q3
12 Volts
12
13 = 50 uA
Assume b >> 1, VBE(on) = 0.7 volts, all npn junction areas identical, and all pnp junction areas are
identical.
VCC = 12 volts. Also assume IREF = 0.5 mA and Circuit 3 current, 13 = 50 µA. Compute:
(a)
R1
(b)
12
(c)
R2 =
_(Think Widlar!!!)
-W-
Transcribed Image Text:BJT Current Mirror System R2 CIRCUIT 1 Q5 IREF = 0.5 mA Q4 R1 Q6 CIRCUIT 2 CIRCUIT 3 VcC Q1 Q2 Q3 12 Volts 12 13 = 50 uA Assume b >> 1, VBE(on) = 0.7 volts, all npn junction areas identical, and all pnp junction areas are identical. VCC = 12 volts. Also assume IREF = 0.5 mA and Circuit 3 current, 13 = 50 µA. Compute: (a) R1 (b) 12 (c) R2 = _(Think Widlar!!!) -W-
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