what is Native Transistor in Spice Model

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ethan

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native transistor

Hi there,

I have seen the following in SPice Model:

// tt : typical model for 1.8V devices
// ss : Slow NMOS Slow PMOS model for 1.8V devices
// ff : Fast NMOS Fast PMOS model for 1.8V devices
// sf : Slow NMOS Fast PMOS model for 1.8V devices
// fs : Fast NMOS Slow PMOS model for 1.8V devices

//
// tt_na : typical model for 1.8V native NMOS
// ss_na : Slow NMOS for 1.8V native NMOS
// ff_na : Fast NMOS for 1.8V native NMOS
// sf_na : Slow NMOS for 1.8V native NMOS
// fs_na : Fast NMOS for 1.8V native NMOS

So, what is the Native Transistor? What is the different between normal device and native device?

ethan
 

nmos spice tt

Native transistor does not have threshold implant adjustment therefore it usually has very low threshold value but also very low flicker noise (because of less oxide damage)

nathan
 

what is native device

The natives need a negative vgs to turn off. It can be used in switches that have a commom mode voltage in fully diferential circuits. It helps to reduce the size of the switches against distortion.

bastos
 

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