For the transistors in the TTL circuit in Figure, the parameters are βF = 20 and βR = 0.
(a) Determine the currents i1, i2, i3, i4, iB2, and iB3 for the following input conditions: (i) vX = vY = 0.1 V, and (ii) vX = vY = 5 V.
(b) Show that for vX = vY = 5 V, transistors Q2 and Q3 are biased in saturation.
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