Problem-1 [40 Points]

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

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

is in=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 (ic₁ and icz), and the

difference in percent of the collector currents as referred to the total current (((ic₁ -

icz)/iT) x 100).

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

iT

Tr.4

(B1)

REA

LEA

ict

CEA

E

lica.

Q

CEZ

E₂

REZ

LEZ

Tr.2

(B2)

Fig. 1: Transistors in Parallel

Rc

Vcc