An increase in threshold voltage when reverse bias is applied between source and substrate (body), because the depletion charge grows. Also called the substrate bias effect; it is sometimes used to tune the threshold.
Field: MOSFET
Reverse-biasing the source-to-body junction widens the depletion region under the gate and increases its charge, so a larger gate voltage is needed to compensate—the threshold voltage rises (the body effect).
In an n-channel MOSFET, what happens to the threshold volta…In a source follower the source tracks the gate minus VGS, so the voltage gain is slightly below 1 (gmRs/(1 + gmRs)) and non-inverting; the body effect lowers it further.
Which is a characteristic of a MOSFET source follower (comm…The body effect raises Vth as the source potential climbs, so the actual level is a bit lower still.
In a pass transistor (switch) made of a single nMOSFET with…Threshold voltage Emitter follower Transmission gate Channel-length modulation CMOS DIBL Flat-band voltage GIDL (gate-induced drain leakage) Inversion layer LDD structure