1. Each transistor in figure, has a dc current gain βdc
= 50,
cut in voltage Vγ = 0.65 volts and VBEsat
= 0.75 volts.
The output voltage Vo for T2 in saturation can
be as high as
0.2 volts. Assume 0.7 volts drop across a conducting PN junction.
Determine
(a) The
minimum value IB2 necessary to keep T2
saturation.
(b) The
maximum permissible value for the resistance
RB1.
(c) The worst case high input (logic 1) and the worst case
low
input (logic 0) for which T2 will be either in
saturation or in cut
off.
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