h32_lecture24_2

# h32_lecture24_2 - Lecture 24 kT/C Noise Boris Murmann...

This preview shows pages 1–3. Sign up to view the full content.

EE 214 Lecture 24 (HO#32) B. Murmann 1 Lecture 24 kT/C Noise Boris Murmann Stanford University [email protected] Copyright © 2004 by Boris Murmann EE 214 Lecture 24 (HO#32) B. Murmann 2 Overview Introduction – Having established the basic noise mechanisms in MOSFETS, today's lecture looks at noise in circuits. In particular, we will focus on the so-called kT/C noise that plays an important role in the design of switched capacitor amplifiers. Based on the calculated total output referred noise, we will derive useful design considerations for low noise OTAs.

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

View Full Document
EE 214 Lecture 24 (HO#32) B. Murmann 3 Recipe for Output Noise Calculations To find the output referred noise in an arbitrary circuit – Draw small signal model – Set input(s) to zero – For each noise generator x, calculate either H x (s)=v o (s)/v nx (s) or H x (s)=v o (s)/i nx (s) – Calculate total spectral density at output Integrate over relevant bandwidth to find noise power Tedious, but simple… () = 2 1 f f 2 tot , o n df f v P ( ) ( ) ( ) f v f 2 j H f v 2 x 2 x x 2 tot , o = π EE 214 Lecture 24 (HO#32) B. Murmann 4 Example 1: RC Circuit The total noise power at the output can be found by integrating the above expression from 0 to infinity C R + v i - + v o - C R + v o - v R 2 2 2 o sRC 1 1 R kT 4 f v + = + = 0 2 2 tot , o df RC f 2
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/17/2008 for the course EE 214 taught by Professor Murmann,b during the Fall '04 term at Stanford.

### Page1 / 8

h32_lecture24_2 - Lecture 24 kT/C Noise Boris Murmann...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online