Question

1. A voltage regulator using a zener diode $D_z$ is shown in Figure 1. $D_z$ is specified to have a 15.3V drop at a test current of 30mA with an incremental resistance $r_z$=15Ω and knee current $I_{zk}$=1mA. (i) Draw the i-v curve for $D_z$. Label axes and all relevant points. Rs For no load and nominal supply: (ii) Find the value of the voltage $V_{OUT}$. [11] [13] (iii)Mark this operating point on the i-v curve of (i). A load resistance of $R_L$ of 5ΚΩ is added to the output. (iv) What will be the percentage change in $V_{OUT}$? [13] (v) Mark this operating point on the i-v curve in (i) A load resistance of $R_L$ of 1ΚΩ is added to the output. (vi) What will be the $V_{OUT}$ for this load? [13] (vii) Mark this operating point on the i-v curve in (i) V supply = 20 V Figure 1 500Ω $D_z$ $V_{OUT}$

          1. A voltage regulator using a zener diode $D_z$ is shown in Figure 1.
$D_z$ is specified to have a 15.3V drop at a test current of 30mA with an incremental
resistance $r_z$=15Ω and knee current $I_{zk}$=1mA.
(i) Draw the i-v curve for $D_z$. Label axes and all relevant points.
Rs
For no load and nominal supply:
(ii) Find the value of the voltage $V_{OUT}$.
[11]
[13]
(iii)Mark this operating point on the i-v curve of (i).
A load resistance of $R_L$ of 5ΚΩ is added to the output.
(iv) What will be the percentage change in $V_{OUT}$?
[13]
(v) Mark this operating point on the i-v curve in (i)
A load resistance of $R_L$ of 1ΚΩ is added to the output.
(vi) What will be the $V_{OUT}$ for this load?
[13]
(vii) Mark this operating point on the i-v curve in (i)
V supply = 20 V
Figure 1
500Ω
$D_z$
$V_{OUT}$

1 a voltage regulator using a zener diode dz is shown in figure 1 dz is specified to have a 153v drop at a test current of 30ma with an incremental resistance rz15 and knee current izk1m 71638

Added by Ryan C.

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