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ieropsaltic said:A zero Vt device is a MOSFET device that has zero threshold voltage i.e it's normally on, it can be used for numerous applications. For analog circuits, it can be used as MOS capacitor. At MOS cap., we use the capacitance between the gate and the substrate to have a certain capacitance. This requires the MOSFET to be on. For usual MOSFETs, this requires biasing by making Vgs>Vt but for zero Vt devices, biasing is not required.
For digital circuits, 0-Vt MOSFETs can be used at transmission gates to deliver strong ones and zeros and to enable gates of MOSFETs of other transmission gates by a transmission gate logic output.
These devices however require an extra mask thus higher costs and suffer from higher leakage.