Current cancellation technique improves linearity

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simplsoft

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current cancellation technique in OTA

Hello
can anyone help me understanding the attached OTA.
In the attached figure of OTA (taken from research article). Its mentioned that transistor MN' and MN are used for current cancellation. Can anyone explain how. The current flowing from MN' transistor is going to the transistor MBN and MBN'. How the current is being cancelled.

Please can anyone explain?

Thanx
 

Re: current cancellation technique in OTA

The small signal current carried by M1 is cancelled by MN' and vice-versa for M2.
 

Re: current cancellation technique in OTA

Thanx for your reply. Yes but how? because according to my knowledge the current from M1 and current fron MN' is going to add at VCM- node and viceversa for the other side. How is the current being cancelled.

thanx
 

Hello

I want to ask about how current cancellation technique improves linearity. The circuit diagram is shown below.



I cant understand how current cancellation is improving the linearity can anyone help.
 
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