Question $1$

$($a$)$

A diode has the current$-$voltage equation

$($

$)$

$9$

$510$

exp $20$

$1$ A

D

D

I

V

$$

$$

$$

$=$

$$

$$

$$

$.$

i$.$

Derive an expression for the diode small$-$signal res

istance and determine its value for

$0\mathrm{.}8$ V

D

V

$=$

$.$

$(6$ marks$)$

ii$.$

A $20$ mV peak$-$to$-$peak sinewave voltage is added to t

he diode bias voltage of $0\mathrm{.}8$ V$.$

Determine the diode AC power dissipation