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## Homework Statement

Design the circuit in the following figure so that ##V_o = 3V## when ##I_L = 0## and ##V_o## changes by ##20mV## per ##1mA## of load current.

(a) Use the small-signal model of the diode to find the value of ##R##.

(b) Specify the value of ##I_S## (saturation current) of each of the diodes.

## Homework Equations

## The Attempt at a Solution

I don't understand how part (a) is to be accomplished. Assuming a diode current ##I_D## flows from top to bottom, the current can be found from:

$$I_D = \frac{15V - 3V}{R}$$

The small signal resistance is given by:

$$r_d = \frac{V_T}{I_D}$$

The answer is listed as ##2.4k##, but I am unsure how to proceed.

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