PHYSICS 3K03 Lecture Notes - Lecture 9: Threshold Voltage, Common Drain, Dopant

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graybeetle998

22 Jun 2018

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Common-drain

configuration

- AKA source follower

- Non-inverting configuration with very high

- Good voltage buffer to connect a voltage signal with a high output resistance, via a high-

input-resistance, to a moderate/low load resistance

Body effect: Large signal modification:

threshold voltage when

Fermi potential (typcially,

dopant concentration in the p-type or n-type (respectively) substrate

dielectric permittivity of silicon ()

Small signal modification:

Example circuit:

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T model: use when load resistor at source

Input impedance of gate is infinite