{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

h4 - Homework 4 ECE 403 NCSU Prof Bilbro due before lecture...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Homework 4, ECE 403, NCSU, Prof. Bilbro due before lecture on Friday, 2/13/09 1) Draw a pmos current mirror with two matched p-channel FETs that is biased with ideal current source I bias , and that is connected to some arbitrary circuit represented only by I out and V out (i.e. you can’t assume anything about the relation between I out and V out .) For concreteness, let’s label the transistors like the current mirror in J&M’s figure 3.4, so that the bias pmos is M3 and the load pmos M2. Show that the low-frequency small-signal model of your current mirror is a simple passive resistor connecting v out to (small-signal) ground with r ds2 = 1 / ( λ pmos I bias ) . 2) Consider the C-S amp from J&M Figure 3.4 and assume that M3 and M2 are matched (i.e. that both of these pmosfets have the same W and L as well as the same current model) . a) Show that the small signal low-frequency gain of this amp is ( 29 1 1 1 0 1 2 2 2 bias bias m V ds ds pmos nmos pmos nmos bias k k I I g A g g I l l l l = - = - = - + + + if the amp is unloaded (i.e. if it’s not connected to any external load.)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online