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.

How to calculate SNR in this case?

Status
Not open for further replies.

yushen_yang

Newbie level 6
Joined
Nov 8, 2005
Messages
11
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,281
Activity points
1,386
Hi all,

I am design a 10bits pipeline ADC and by followingprevious articles I use Matlab to do FFT. But here are the problems I met.

fin=100Khz, fs=10Mhz,
N=8192(number of data points in FFT),
M=83 (integer number of cycles within the sampling window),

First I used coherent sampling method to do FFT and I got a result, freqd_1.
Then I used window sampling mehtod (hamming window)to do FFT again and got freqd_2.

Why are the noise floors in these two pictures different?

how should I determine the noise floor to get the SNR?

SNR=nosie floor - 10*log (fs/2/8192)? Is this right?

why are the bins quite high comparing to noise floor?

Yu-Shen
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top