Quiz 3 (class 42)
1.
For the circuit shown in FIGURE 1, assume
𝑽𝑩𝑬 = 𝟎. 𝟕𝑽 independent of current level.
(a) Find the voltages and currents of emitter, base,
and the collector.
𝑰𝑬
𝑰𝑩
𝑽𝑬
(b) What is the mode of operation of this transistor?
𝑽𝑪
𝑰𝑪
2. Using 𝜷 = ∞, 𝑽𝑩𝑬 = 𝟎. 𝟕𝑽, design the circuit
shown in FIGURE 2. The emitter currents of
𝑸𝟏 , 𝑸𝟐 , 𝒂𝒏𝒅 𝑸𝟑 are 0.3mA, 0.5mA, 0.6mA, respectively,
and 𝑽𝟐 = 𝟐𝑽, 𝑽𝟑 = −𝟑𝑽, 𝒂𝒏𝒅 𝑽𝟔 = 𝟐. 𝟔𝑽.
(a) Find the resistor value 𝑅1, 𝑅2 , 𝑅3 , 𝑅4 , 𝑅5 , 𝑅6
(b) Find emitter and collector Voltage 𝑉1 , 𝑉4 , 𝑎𝑛𝑑 𝑉5
(c) For each transistor 𝑸𝟏 , 𝑸𝟐 , 𝒂𝒏𝒅 𝑸𝟑 , identify the
mode of operation.
1