When driving large capacitive loads, the best way to size an inverter chain used as

$10$ pts

a buffer is $($select the best answer$)$: Select$]$

$2)$ A unit inverter in a particular process has an input capacitance of $10$ fF and a

propagation delay of $20$ ns$.$ It is necessary to size an inverter chain to drive a load of

$10$ pF$.$ Assume gamma of $1.$

$($a$)$ What is the unbuffered $($ie$.$ one stage unit inverter$)$ delay to drive this load?

$($b$)$ What is the best delay of a three stage buffer and what is the sizing ratio?

$($c$)$ What iS the best delay of a four stage buffer and what are the inverter sizes?

$($d$)$ What is the optimum delay possible, how many stages are necessary and what

are the sizes of the inverters in the chain?