• Electrical Engineering Archive: Questions from 2023-10-19

    For the series regulator shown in Figure 9.2, assume that RL = 32, Vz = 10V, and for the BJTs, B = 100 and VBE = 0.7V. (a) Calculate the power efficiency of the regulator. (Hint: Express VL in terms of VZ and other components in the circuit. Verify the assumptions made in deriving VL). (b) The Zener diode voltage thermal coefficient is +3mV/K and the base-emitter voltage thermal coefficient is -2mV/K. Assuming that the Zener diode and base-emitter voltages as well as their thermal voltages have negligible change with their existing operating currents. Calculate the thermal coefficient of the output voltage.
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    A simple current bias reference circuit based on the base-emitter junction voltage is depicted in Figure 9.3. Determine the sensitivity S of the output current to supply voltage VCC. It is given that IS = 5
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    9.34 Determine the sensitivity S of output current lo to supply voltage Vcc for the circuit in Fig. P9.34. S is defined as S = VCC/Io/8Io/8Vcc
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