Page 34 - Schaum's Outline of Theory and Problems of Electric Circuits

CIRCUIT CONCEPTS
CHAP. 2]

Fig. 2-25 23

Fig. 2-26

2.39 The diode of Example 2.4 operates within the range 10 < i < 20 mA. Within that range, approximate its
terminal characteristic by a straight line i ¼ v þ , by specifying and .
Ans. i ¼ 630 v 4407 mA, where v is in V

2.40 The diode of Example 2.4 operates within the range of 20 < i < 40 mA. Within that range, approximate its
terminal characteristic by a straight line connecting the two operating limits.
Ans. i ¼ 993:33 v 702:3 mA, where v is in V

2.41 Within the operating range of 20 < i < 40 mA, model the diode of Example 2.4 by a resistor R in series with
a voltage source V such that the model matches exactly with the diode performance at 0.72 and 0.75 V. Find
R and V. Ans. R ¼ 1:007
; V ¼ 707 mV