Hello, everyone

I have problem about the ratio of the Vout/I(in)

as shown in the attachments

the method i use:

let the gate voltage of M2 be vx

Vout/I(in)=Vout/vx*(vx/I in)

I don't know how to figure out (vx/I in)

does the small signal model include R(D1)?

and the current through RD1 is?

can any one help me?

I have problem about the ratio of the Vout/I(in)

as shown in the attachments

the method i use:

let the gate voltage of M2 be vx

Vout/I(in)=Vout/vx*(vx/I in)

I don't know how to figure out (vx/I in)

does the small signal model include R(D1)?

and the current through RD1 is?

can any one help me?

#### Attachments

Last edited: