Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Can anybody give me a hint-----noise analysis in SAR adc?

Status
Not open for further replies.
L

luantan

Newbie level 5
Joined
Aug 23, 2004
Messages
8
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
SHANGHAI
Activity points
73
noise analysis + sar adc

Everybody knows that a SAR ADC contains a DAC and a comparator.
If the comparator is required to be high speed, then it may be auto zeroed comparator
consists of several cascaed pre amplifiers and a latch.

my question is :
How the noise of the comparator should be caculated, what is the noise bandwidth?
Is the noise bandwidth just the bandwidth of the preamplifier?
or is the noise bandwidth the nyquist frequency of that ADC?
or something else....?
why?:cry:
Thank u for give me a hint, this problem make me so troublesome for a long time.
Thank u for your valueble suggestion!!!!!
 

noise analysis

thaoa's sp simlple;
just imagine that noise is white nose;
psd is eta/2; now integrate the psd over band width uget the power valu;
power ia equal to voltage square upon resistance valu;
so if r=1; v=sqrt of power ;thatis value of noise voltage.

rag_perfect.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top