Could anyone give me the model for weak inversion mosfet subthreshold?

[Osawa_Odessa]

Hello,
Could anyone give me the model for weak inversion mosfet subthreshold?

 

[sam_icdesign]

basically its like strong inversion (SI). in SI you would have saturation if VDS>VGS-VT and triode if VDS<VGS-VT and VGS has to be larger than VT by 200 300mV for both senarios. in weak inversion VGS<VT and its in saturation if VDS> almost 100mV and triode if VDS< 100mV. this is not exactly accurate but it gives you an idea of the whole thing. look at the EKV model for a n more accurate explanation

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basically its like strong inversion (SI). in SI you would have saturation if VDS>VGS-VT and triode if VDS<VGS-VT and VGS has to be larger than VT by 200 300mV for both senarios. in weak inversion VGS<VT and its in saturation if VDS> almost 100mV and triode if VDS< 100mV. this is not exactly accurate but it gives you an idea of the whole thing. look at the EKV model for a n more accurate explanation