Activity: Noise Analysis: Difference between revisions

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== Activity 1: MOSFET Noise ==
== Activity 1: MOSFET Noise ==
Bias a 1.8V LVT NMOS transistor with <math>V_{GS}=0.9\mathrm{V}</math> and <math>V_{DS}=0.9\mathrm{V}</math>. For a width of <math>10\mathrm{\mu m}</math> and a length of <math>0.30\mathrm{\mu m}</math>:
* What is the resulting DC drain current?
* What is the transistor's <math>g_m</math> and <math>V^*</math>?
Run a noise analysis from <math>1\mathrm{Hz}</math> to <math>100\mathrm{GHz}</math>. You can use this [https://github.com/louisalarcon/ee220/blob/80eb5f2084bd46437356fd80fad6b938a836d71c/cidr/mos-noise-corners.sch sample schematic] as a starting point.
* Plot the drain current noise power spectral density.
** Identify the regions where thermal noise and flicker noise dominates.
** What is the flicker noise corner?
** Estimate the value of <math>\gamma</math>.
** Estimate the value of <math>\frac{K_f}{C_{ox}}</math>
* What is the total integrated drain current noise power? 
Change the length of the transistor to <math>0.40\mathrm{\mu m}</math>. Identify and explain any changes in the drain current noise power spectral density.


== Activity 2: Noise Analysis ==
== Activity 2: Noise Analysis ==

Revision as of 09:54, 26 October 2022

  • Instructions: This activity is structured as a tutorial with an activity at the end. Should you have any questions, clarifications, or issues, please contact your instructor as soon as possible.
  • At the end of this activity, the student should be able to:
  1. Perform noise simulations using NGSPICE.

Activity 1: MOSFET Noise

Bias a 1.8V LVT NMOS transistor with and . For a width of and a length of :

  • What is the resulting DC drain current?
  • What is the transistor's and ?

Run a noise analysis from to . You can use this sample schematic as a starting point.

  • Plot the drain current noise power spectral density.
    • Identify the regions where thermal noise and flicker noise dominates.
    • What is the flicker noise corner?
    • Estimate the value of .
    • Estimate the value of
  • What is the total integrated drain current noise power?

Change the length of the transistor to . Identify and explain any changes in the drain current noise power spectral density.

Activity 2: Noise Analysis

A Common-Source Amplifier

A Cascode Amplifier

Activity 3: Input-Referred Noise

Report Guide

Write up a report (maximum of 5 pages including figures) answering the questions above. Include annotated graphs if needed.

Submission

This activity is for both graduate and undergraduate students. For UP students, the submission bin link will be posted in Piazza.