Problem-1 [40 Points]

Two transistors Tr₁ and Tr2 are parallel connected, as shown in the following figure.

For a forward-biased de steady-state operation, it is known that the total load current

is iT=200/A/, the collector-emitter voltage of the first transistor is VCE1 =1.5/V/, and of

the second transistor is VCE2=1.1/V/.

The resistances series connected to transistors have the value of RE1- 10/m/ and

RE2=20/m2/, respectively.

For each transistor calculate the collector's current value (ic and icz), and the

difference in percent of the collector currents as referred to the total current (((ici —

İcz)/iT) x 100).

It is added that to solve the problem, the base current is neglected.

ir

Tr.4

(B1)

REA

L'EL

ica

CI

CEA

E

lica.

+

NCEZ

Tre

REZ

AEZ

(B2)

Fig. 1: Transistors in Parallel

Rc

Vcc