1 (92)

Prévia do material em texto

Step of 9 8.060P Refer to Figure P8.60 from the text Calculate the value of the emitter current 4.3k Substitute 0.7 for 5-0.7 4.3k 4.3 4.3k =1 mA Therefore, the value of the emitter current mA The value of the collector current is approximately equal to the emitter current Therefore, the value of the collector current mA Step of 9 Calculate the value of the resistance ro Substitute 100 V for and mA for 100 Therefore, the value of the resistance is 100 Step Calculate the value of the tranconductance Substitute mA for and 25 mV for 8m 40 mA/V Therefore, the value of the transconductance is 40 mA/V Step Calculate the value of the resistance Substitute 40 mA/V for and 100 for 100 Therefore, the value of the resistance is Step Draw the small signal equivalent circuit to find the output resistance + e Figure 1 Step Consider the expression for the voltage Therefore, the expression for the voltage IS Step of 9 Consider the expression for the output voltage Substitute for Here, represents the output resistance (1) Therefore, the expression for the output resistance is Step Recall equation (1) Substitute 100 for 40 mA/V for for R, and for 6.8k Therefore, the value of the output resistance R, IS Step Calculate the change in the value of the collector current Substitute 10 for and 6.42 for 10 6.42 M Therefore, the value of the change the collector current is 1.57