sheldon wrote on Feb 19th, 2011, 2:52am:Nandish,
Is the amplifier still biased correctly when mismatch is included?
In particular, are the cascode devices still biased? You also did not
mention single-ended or differential, if the design is differential does
mismatch degrade the common mode loop?
Best Regards,
Sheldon
Hi Sheldon,
The folded cascode ota has differential input and single ended output. (PMOS active load is diode connected on one side)
When mis-match analysis is ran the cascode is biased with constant drain current biasing whereas the input pair are biased by constant DC source to the respective input common mode.
Sheldon, can you please recommend some scheme for the input pair biasing so that I can keep the gm of these devices constant?
Thanks for your response. I think from your questions I have got a hint to solve my problem. It will be kind of you if you can suggest me some biasing scheme which are commonly used for input pair.
Regards
Nandish