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Help in gm/Id methodology for designing subthreshold OTA

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simplsoft

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Designing of Subthreshold OTA

Can anyone help be in designing a simple OTA in subthreshold region. The Current equation I know is ID=Io x e(VGS/nVT), what will be the Io? and how can I design the OTA?
 

Can any one help me in understanding the gm/Id methodology. I want to design an OTA in subthreshold region. I have read in some article that people have used gm/Id method. How can I use the gm/Id method to design an OTA in subthreshold region?
 

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