I am currently studying about small signal models of Common Drain & Common Gate configuration, where the body transconductance has significant effect on voltage gain and output resistance (when body effect is significant). I also know the principle of body effect - body effect occurs when Vbs < 0; for NMOS device.
I am curious about how a designer of electronic circuits deals with the body transconductance values, since its value isn't given by data sheets. I doubt its can be neglected when performing hand calculations.
Can body effect occurs, although it is connected to most negative potential of NMOSFET? (Perhaps oscillations can make Vbs ≠ 0)
Can someone gives me an example or two, where body transconductance (it can be also referred as "body current generator" or "back gate") has a significant affect on a circuit as a whole?