2010-312the1
TRANSCRIPT
EE 312-DIGITAL ELECTRONICS SPRING 2009/2010
TAKE-HOME EXAM # 1: FINDING THE STATE OF THE TRANSISTORS Delivered on: 9 March 2010 Due (in class): 16 March 2010
10) For the transistor shown in Figure 1, assume
α≅1 and VBE = 0.5V at the edge of conduction. VBE,SAT = 0.8V and VCE,SAT = 0.2V. What are the values of VE and VC for VB = 0V? For what value of VB does the transistor cut off? Saturate? In each case, what are the values of VE and VC?
11) In circuit shown in Figure 2, the transistor has β = 30. VEB,SAT = 0.8 V and VEC,SAT = 0.2 V. Find the values of VB, VE, and VC. If RB is raised to 270 kΩ, what voltages result? With RB = 270 kΩ, what value of β would return the voltages to the values first calculated?
Figure 1
Figure 2