oftage-regulator circuit shown in Fig. P4.57. The value of R IS selected to obtain an output voltage Vo (across the diode) of 0.7 V. V+ Vo Figure P4.57 (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 AV AV+ V, V+ +V, – 0.7 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.
oftage-regulator circuit shown in Fig. P4.57. The value of R IS selected to obtain an output voltage Vo (across the diode) of 0.7 V. V+ Vo Figure P4.57 (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 AV AV+ V, V+ +V, – 0.7 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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Transcribed Image Text:"4.57 Consider the voltage-regulator circuit shown in Fig. P4.57. The value of R is selected to obtain an output
voltage Vo (across the diode) of 0.7 V.
Vo
Figure P4.57
(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
AV.
V,
V+ + V, – 0.7
AV+
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) Caleulate the value of line regulation for the case V = 10 V (nominally) and (i) m = 1 and (ii) m = 3.
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