Lecture 20 - MOS CV

Lecture 20 - MOS CV - MOS CV Characteristics Objective:...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 MOS CV Characteristics Objective: Understand the physics and models of semiconductor devices including … field-effect transistors. Questions to be answered: • What is the capacitance for each biasing region? • How does the capacitance very with frequency? EE360 – Lecture 20 • What can we determine about the MOS capacitor from a CV curve? • What do we mean by “deep depletion”? Biasing Regions: Review (p-bulk) S s qN K W φ ε 0 2 = Depletion: A ) 2 0 ( 2 0 F S S S s A o s o G K qN K K x V + = EE360 – Lecture 20 F A s qN K W 2 2 0 = Inversion: F s A o s o F T K qN K K x V 2 2 2 0 + = From Pierret, pg. 570
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Biasing Regions: Review (n-bulk) Accumulation Depletion 0 < φ S < 2 F EE360 – Lecture 20 () 0 2 s S D K W qN ε =− Depletion: 0 2 (2 0) s D Go S SF S os K qN Vx KK φφ = −− + From Pierret, pg. 569 Biasing Regions: Review (n-bulk) Onset of Inversion From Pierret, pg. 569 S = 2 F Inversion EE360 – Lecture 20 0 2 2 s F D K W qN Inversion: 0 2 22 ( ) s D TF o F K qN
Background image of page 2
3 MOS CV Characteristics: Preview CV Measurement: Sweep DC bias with small AC signal (usually 1MHz) n-bulk Measure AC current and calculate capacitance Low frequency measurements require more sophistication From Pierret, pg. 585 EE360 – Lecture 20 Capacitance depends on bias: accumulation, depletion, and inversion regions are distinct
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/20/2008 for the course EE 360 taught by Professor Hastings during the Spring '08 term at Kentucky.

Page1 / 7

Lecture 20 - MOS CV - MOS CV Characteristics Objective:...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online