Native transistor
In electronics, a native transistor (or sometimes natural transistor) is a variety of the MOS field-effect transistor that is intermediate between enhancement and depletion modes. Most common is the n-channel native transistor.
Historically, native transistors were referred to as MOSFETs without specially grown oxide, only natural thin oxide film formed over silicon during processing of other layers.[citation needed]
A native MOSFET is a transistor with nearly zero threshold voltage. Native n-channel transistors have a niche applications in low-voltage operational amplifiers and in low-voltage digital memory, where it functions as the weak pull-down. It also used in low-voltage interface circuits.
The main disadvantages of the native transistors is the larger size due to additional doping mask, and sometimes lower transconductance. Typical minimal size of the native NMOS gate is 2-3 times longer and wider then standard threshold voltage transistor. The cost of chips including native transistors is also increased because of the additional doping operations.