A Question regarding Ft of a technology node

venn_ng · Mar 26, 2017

Hi guys,

Can you answer this question regarding "ft"?

https://circuitdesignquiz.wordpress.com/2017/03/26/an-easy-one-ft/

Regards,
venn_ng

pancho_hideboo · Mar 26, 2017

Hi, iVenky(https://www.edaboard.com/members/434760/).

Assume operation point Vout_dc.
Idrain=I0-Vout_dc/Rx. Here I0 is a value of current source.

ft will be changed with this Idrain.

venn_ng · Mar 26, 2017

What if "Rx" is the small signal impedance of the transistor?

pancho_hideboo · Mar 27, 2017

Hi, iVenky(https://www.edaboard.com/members/434760/).

venn_ng said:
What if "Rx" is the small signal impedance of the transistor?

gm will be degrated to gm-1/Rx.

venn_ng · Mar 31, 2017

pancho_hideboo said:
Hi, iVenky(https://www.edaboard.com/members/434760/).

gm will be degrated to gm-1/Rx.

I don't think that's right. See the comments section of that page to find the answer.

A Question regarding Ft of a technology node

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