Consider the voltage-regulator circuit shown in Fig.
Chapter 4, Problem 4.52(choose chapter or problem)
Consider the voltage-regulator circuit shown in Fig. P4.52. The value of R is selected to obtain an output voltage VO (across the diode) of 0.7 V. (a) Use the diode small-signal model to show that the change in output voltage corresponding to a change of 1 V in V+ is This quantity is known as the line regulation and is usually expressed in mV/V. (b) Generalize the expression above for the case of m diodes connected in series and the value of R adjusted so that the voltage across each diode is 0.7 V (and VO = 0.7m V). (c) Calculate the value of line regulation for the case V+ = 10 V (nominally) and (i) m = 1 and (ii) m = 3.
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