UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences EE105 Lab Experiments Prelab 6 Biasing Circuitry Name Lab Section VCC R1 R2 VOUT Figure 1 Resistive divider voltage source 1 Consider the resistor network shown in Figure 1 Let VCC 10 V R1 9 35 k and R2 650 We can turn this resistive divider into a voltage source with an output resistance by taking its The venin equivalent Find the open circuit output voltage and the output resistance of this voltage source 2 Now consider a BJT voltage source such as the one shown in Figure 2 Size resistor RC to achieve an output voltage of 650 mV Let VCC 10 V IS 26 03 fA and VT 26 mV Ignore the Early voltage for this calculation 3 Find the output impedance and the power dissipated by this BJT voltage source Hint Remember the definition of power P IV 1 2 VCC RC IC VOUT Figure 2 BJT voltage source 4 If we were to resize the resistors of our resistive divider Figure 1 to achieve the same output impedance as the BJT voltage source given the same output voltage what would be the values of the two resistors How much power would it draw VCC R IOUT VOUT RL Figure 3 Resistor current source 5 Consider the circuit shown in Figure 3 Let VCC 10 V and R 10 k Roughly sketch IOUT vs VOUT 6 Find the short circuit output current and the output impedance of the current source 3 1 0 8 0 6 IOU T mA 0 4 0 2 0 0 2 0 4 0 6 0 8 1 0 10 20 VOU T V 7 Is it possible to increase the output impedance without decreasing the output current and without changing VCC Explain
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