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Design >> Analog Design >> Current reference
https://designers-guide.org/forum/YaBB.pl?num=1478451938

Message started by asorab on Nov 6^th, 2016, 9:05am

Title: Current reference
Post by asorab on Nov 6^th, 2016, 9:05am

Sir/Maam! I need answers please.
So if I'm going to just set the aspect ratio of mosfets to operate in subthreshold, then the current generated by the mosfet can be used for current reference? Is it correct?

Title: Re: Current reference
Post by vroy_92 on Nov 7^th, 2016, 10:51am

Theoretically yes.
But I will generally not do that.
One because the gm will be high, the Vth mismatch impact will be higher. I might have to use source degeneration (aka stacking devices) which blows up area and last resort.
Secondly, I am apprehensive of the MOS models in subthreshold region, so I will keep away from them.

Title: Re: Current reference
Post by asorab on Nov 10^th, 2016, 3:23am

Thank you sir for your response. May God bless you!