Body effect, Electrical Engineering

Body Effect

The body effect explains the changes in the threshold voltage through the change in the source-bulk voltage, approximated by the subsequent equation:

521_body effect 1.png

In which VTN is the threshold voltage with substrate bias present, and VTO is the zero-VSB value of threshold voltage, γ is the body effect parameter, and 2φ is the surface potential parameter.

1492_body effect.png

Figure: Ohmic contact to body to ensure no body bias; top left: sub threshold, top right: Ohmic mode, bottom left: Active mode at onset of pinch-off, bottom right: Active mode well into pinch-off - channel length modulation evident

The body can be functioned as a second gate, and is sometimes considered to as the "back gate"; the body effect is sometimes known as the "back-gate effect".

Posted Date: 1/11/2013 1:31:47 AM | Location : United States

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