1. Each transistor in figure, has a dc current gain β

_{dc}= 50,
cut in voltage V

_{γ}= 0.65 volts and V_{BEsat}= 0.75 volts.
The output voltage V

_{o}for T_{2}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 I

_{B2}necessary to keep T_{2}
saturation.

(b) The
maximum permissible value for the resistance

R

_{B1}.
(c) The worst case high input (logic 1) and the worst case

low
input (logic 0) for which T

_{2}will be either in
saturation or in cut
off.

## No comments:

## Post a comment