
Transistor amplifiers 277
Input
Figure
15.11
(iv) Base current
/
B
=/
E
-/
c
= (4x 10"3) - (3.961 x 1(T
3
)
= 3.9 x 1(T5 A
10 PRINT PROG 237"
20 PRINT COMMON BASE D.C. CONDITIONS"
30 INPUT "ENTER VEB IN VOLTS" : VEB
40 INPUT "ENTER IE IN MILL
I
AMI'S" ; IE
50 INPUT "ENTER VCD IN VOLTS" : VCU
60 INPUT "ENTER IC IN MILLIAMPS" ; IC
70 LET I1IB-VEB*10~3/IE
80 LET HOB=VCB*10*3/1C
90 LET HFB=IC/IE
100 LET IB=(IE/lO-3)-(IC/IO*3)
110 PRINT "INPUT RESISTANCE = " RIB "OHMS"
120 PRINT "OUTPUT RESISTANCE = " HOB "OHMS"
130 PRINT "CURRENT GAIN = " HFB
140 PRINT "BASE CURRENT = " IB "AMPS"
15.5 Common base - dynamic conditions
The method of calculating the variou ...